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WHOOP 4.0 with 12 Month Subscription – Wearable Health, Fitness & Activity Tracker – Continuous Monitoring, Performance Optimization, Heart Rate Tracking – Improve Sleep, Strain, Recovery, Wellness

4.0 out of 5 stars 2,205 ratings

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Brand WHOOP
Material Metal
Color Onyx
Compatible Devices Smartphones, Tablets, Laptops
Screen Size 4 Inches
Product Dimensions 1.1"L x 0.4"W x 7.1"H
Item Weight 0.31 Pounds
Battery Life 5 days
Sensor Type Optical
Battery Description Lithium-Ion

About this item

  • EVERYTHING YOU NEED IS INCLUDED: Purchase includes an initial 12-month WHOOP membership, 4.0 hardware, Onyx SuperKnit band, and wearable, water-resistant* battery pack. THIS IS FOR FIRST TIME WHOOP MEMBERS.
  • CONTINUOUS MONITORING: WHOOP is a unique wearable fitness device that offers continuous monitoring of physiological data, including heart rate, respiratory rate, resting heart rate, heart rate variability, skin temperature, blood oxygen levels, daily activity and sleep so users can better understand their overall health and wellness status and track their progress over time.
  • PERSONALIZED FOR YOUR GOALS: WHOOP is insight-driven, providing users with clear next steps and a science-backed approach so they can understand and improve their overall health and optimize performance. Track and log your daily behaviors like activity, diet, alcohol consumption, stress levels, caffeine intake and more with the WHOOP Journal. WHOOP then calculates which behaviors help or hurt your sleep and recovery most, making it easier to stick with healthy habits.
  • ON THE GO CHARGING: Get continuous data for days on a single charge with our water-resistant* battery pack that enables you to charge on the go while you wear it.
  • COMMUNITY SUPPORT: WHOOP offers a supportive community of users, including professional athletes and fitness enthusiasts, who share their experiences and insights. This community provides users with inspiration and encouragement as they work to achieve their fitness and wellness goals. Additionally, WHOOP's community provides users with access to expert resources and guidance to help them optimize their health and wellness.
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Product Description

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the only wearable focused on science backed metrics
  • Your purchase includes the WHOOP 4.0 device with Onyx SuperKnit band, a waterproof and wireless battery charger and charging cable, as well as a 12-month WHOOP membership and access to the WHOOP app.

  • Your purchase includes your upfront 12-month membership, you will not be charged during activation. At the end of the 12-months, you will have the opportunity to renew/extend your membership directly with WHOOP membership services.

  • All genuine WHOOP 4.0 products come in retail-specific packaging as pictured above with the 12-month membership noted on the back of the box. If the box received is different, the inclusion of a 12-month membership with the product is not guaranteed.

  • Plug your battery pack into a power source using your WHOOP-provided USB-C cord. Your battery pack is fully charged, the LED turns green. Once the battery pack is fully charged, slide it over the WHOOP 4.0 to charge the sensor before set up.

  • You can reach out to our Membership Services team regarding any hardware or subscription issues. They can be reached 24/7 on the WHOOP app or via support on the WHOOP website. Please reach out to Amazon directly for any issues with shipping or return

Shop WHOOP

    • For Performance and Profession

      Engineered with an ultra-soft backing and microfilament yarn.

    • For Everyday Wear

      Engineered with an ultra-soft backing and micro filament yarn.

    • On the Go Charging

      Get continuous data for days on a single charge.

    • Designed for Durability

      Designed with a durable, stainless steel clasp.

    • A Premium Look

      Designed with precious metals for a premium look.

    • Waterproof

      Charge on the go while you wear it, without worrying about it getting wet.

Product information

Technical Details

Brand ‎WHOOP
Material ‎Metal
Color ‎Onyx
Compatible Devices ‎Smartphones, Tablets, Laptops
Screen Size ‎4 Inches
Product Dimensions ‎1.1"L x 0.4"W x 7.1"H
Item Weight ‎0.31 Pounds
Battery Life ‎5 days
Sensor Type ‎Optical
Battery Description ‎Lithium-Ion
UPC ‎810114360002
Manufacturer ‎WHOOP
Item Package Dimensions L x W x H ‎8.23 x 2.76 x 1.61 inches
Package Weight ‎0.14 Kilograms
Item Dimensions LxWxH ‎7.1 x 1.1 x 0.4 inches
Brand Name ‎WHOOP
Warranty Description ‎Lifetime warranty
Model Name ‎4.0 Health & Fitness Tracker
Suggested Users ‎Unisex-Adult
Part Number ‎973-001-000
Included Components ‎Initial 12-month WHOOP membership, 4.0 hardware, Onyx SuperKnit band, and wearable, water-resistant* battery pack.
Sport Type ‎Exercise & Fitness

Additional Information

ASIN B0BWSF6H4Q
Customer Reviews
4.0 out of 5 stars 2,205 ratings

4.0 out of 5 stars
Best Sellers Rank #2,019 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
#17 in Activity & Fitness Trackers
Date First Available March 14, 2023

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WHOOP 4.0 with 12 Month Subscription – Wearable Health, Fitness & Activity Tracker – Continuous Monitoring, Performance Optimization, Heart Rate Tracking – Improve Sleep, Strain, Recovery, Wellness


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Customer reviews

4 out of 5 stars
2,205 global ratings

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Customers say

Customers find the biometric monitor tracks everything from sleep to recovery and HRV, and is better than Apple Watch in terms of build quality. The device provides lots of helpful data and is great for general fitness improvement, encouraging better routines and habits. While some find it simple to use, others consider it frustrating to operate, and accuracy receives mixed reviews with some finding it accurate while others say it's less precise than Fitbit. Battery life is also mixed, with some reporting it lasts 5-7 days without a charge while others say it doesn't work or last at all. Value for money receives negative feedback, with customers feeling it's not worth the cost.

AI-generated from the text of customer reviews

133 customers mention "Sleep tracking"98 positive35 negative

Customers appreciate the WHOOP's sleep tracking capabilities, noting its ability to monitor recovery, strain, and lighter sleep periods.

"...I love the sleep data and personalized (AI) suggestions based on your health goals and the that the habits that you record...." Read more

"Love the whoop. It gives me great feedback for my sleep, workouts, and several other analytics...." Read more

"...I like that it’s sleep and recovery focused...." Read more

"...2. it logged the wrong type of activity even though I had selected the correct activity (i.e. Cycling not Running or Cycling not Mid-day Nap!)...." Read more

93 customers mention "Build quality"93 positive0 negative

Customers have mixed opinions about the build quality of the biometric monitor, with some finding it better than the Apple Watch and praising its functionality, while others report that it only worked properly for a month.

"...Also, I'm so pleased that the device works with AW and Apple Health...." Read more

"...It fits well and is lightweight. I find it to be a great tool." Read more

"Fantastic product. I've been wearing every day for 3 months. Great insights...." Read more

"...I wear mine daily and have no issues with durability after about 10 months of use...." Read more

70 customers mention "Information quality"58 positive12 negative

Customers appreciate the biometric monitor's data quality, noting it provides lots of helpful information about daily routines, with one customer highlighting its detailed minute-by-minute tracking capabilities.

"Fantastic product. I've been wearing every day for 3 months. Great insights...." Read more

"I'm really enjoying the product and software for my fitness journey. Subscription price feels a little high, but overall I am satisfied...." Read more

"...the Whoop Band for a few months now, and while it has some impressive features, there are a few areas where it falls short for me...." Read more

"...device and app very useful for checking your sleeping cycles, registering activity, tracking your heart rate and strain during the exercise and so..." Read more

53 customers mention "Fitness level"53 positive0 negative

Customers find the biometric monitor effective for health and fitness, helping them improve workouts and intensity while encouraging more activity. One customer mentions it provides instant feedback on daily health performance.

"...I've only had it for less than 2 weeks, it's helped me to recognize when to push myself harder and when I should take a recovery day...." Read more

"Love the whoop. It gives me great feedback for my sleep, workouts, and several other analytics...." Read more

"Great health and fitness tracker overall!..." Read more

"...Overall, the Whoop Band is a solid choice for serious athletes who want detailed health insights and don’t mind the subscription fee...." Read more

69 customers mention "Accuracy"34 positive35 negative

Customers have mixed opinions about the accuracy of the biometric monitor, with some finding the data precise while others report that it is less accurate compared to Fitbit.

"...It gives me great feedback for my sleep, workouts, and several other analytics...." Read more

"...And your heart rate is quite elevated. My Apple Watch records this session at a bit over 400 calories. My WHOOP records it at 258 calories...." Read more

"...So far it has been GREAT. The data on this thing is pretty accurate and I’ll keep you guys updated." Read more

"I should have done the trial first. The steps are way off, I mean almost double what they should be, which in turn makes the calorie burn way off...." Read more

58 customers mention "Ease of use"27 positive31 negative

Customers have mixed experiences with the device's ease of use, with some finding it simple to use and the app easy to set up, while others describe it as frustrating and confusing.

"...canned responses and useless troubleshooting pages...." Read more

"...I love that I can charge on the go or in the shower, it's really convenient not needing to take the band off. Also, why are the bands so expensive?..." Read more

"...The interface is a bit awkward and not intuitive; its rigid interface makes you learn what it wants from you rather than supporting ease of..." Read more

"...It seems to be very accurate and easy to understand. I love the fact that you can research each and every health tracker has...." Read more

56 customers mention "Battery life"22 positive34 negative

Customers have mixed experiences with the biometric monitor's battery life, with some reporting it lasts up to 5-7 days without charging, while others find it doesn't work or only lasts 4 days.

"...Only complaints are the membership fee is high and battery life is so-so. I’m recharging about every other day." Read more

"...I like the fact I don’t have to take it off to charge and the battery life is good. It fits well and is lightweight. I find it to be a great tool." Read more

"...The strap also seems to randomly power off, even with a fully charged battery, losing more data...." Read more

"...It is very lightweight And comfortable. Battery life is about a week, However, in a bit of pretty ingenious engineering, you don’t take it off to..." Read more

97 customers mention "Value for money"27 positive70 negative

Customers find the biometric monitor to be overpriced, particularly noting that the subscription fee for subjective information is outrageous.

"...The starter band kinda sucks, so I'd recommend budgeting for one if you plan to keep your whoop...." Read more

"...This is disappointing because the device is both expensive and has an expensive subscription associated with it...." Read more

"...is whenever I drink alcohol and has basically paid for itself in money saved from drinks...." Read more

"...Subscription price feels a little high, but overall I am satisfied. The sub price is the only reason I didn't give 5 stars...." Read more

Life changing.
5 out of 5 stars
Life changing.
As somebody who has severe PTSD is difficult for me to recognize physiologically when I am stressed. I’ve gained so much insight on my health and awareness of my body of what it’s doing when it’s doing it. This device has helped me “calibrate“ so to speak how I feel physiologically and my awareness of that feeling.
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Top reviews from the United States

  • Reviewed in the United States on April 16, 2025
    I was hesitant in buying this due to some of the poor reviews. The device is excellent for anyone who is interested in understanding the quality of their sleep and recovery. While I've only had it for less than 2 weeks, it's helped me to recognize when to push myself harder and when I should take a recovery day. I love the sleep data and personalized (AI) suggestions based on your health goals and the that the habits that you record. The starter band kinda sucks, so I'd recommend budgeting for one if you plan to keep your whoop. Also, I'm so pleased that the device works with AW and Apple Health. I don't think it's an either / or but more that the devices compliment one another.
  • Reviewed in the United States on May 3, 2025
    Love the whoop. It gives me great feedback for my sleep, workouts, and several other analytics. I like the fact I don’t have to take it off to charge and the battery life is good. It fits well and is lightweight. I find it to be a great tool.
  • Reviewed in the United States on August 22, 2024
    ** update March 9. I completed a 5.1 mile hike with an average pace of 3.5 mph. What does the whoop say? 271 calories. If you look at the internet. For my weight and that pace the calorie burn is between 550 and 620 kcal. But whoop, whoop says 271. I have never used a more inaccurate unreliable piece of trash.

    **update 10/19 deducting yet another star. The device is basically worthless. Sad because it’s a good idea and is expensive. Did a 3 mile walk this morning to warm up. I’m 190# man. Walking a flat mile even at a somewhat leisurely pace costs my body 110-125Kcal. Wearing the whoop and my Apple Watch. Watch records 350 kcal burned. The whoop…123. Both set to “walking” worn on opposite wrists. 123 vs 350. The device is absolute garbage. Avoid it.

    ** update 9/12. Deducting another star

    I really wanted to love this device and maybe mine is just a lemon. The readings, specifically heart rate which is one of the only things I am really truly interested in are so far from accurate that the device is almost worthless. This is disappointing because the device is both expensive and has an expensive subscription associated with it. I did a hard workout again wearing both my Apple Watch and my WHOOP. Was 30 minute EMOM. Alternating rounds of 10 double unders And 15 Russian kettlebell swings at 80#. So at least for me a metabolically demanding workout. During the double unders Apple Watch has my heart rate pegged between 165 and 175 Which makes sense based on the activity and how I feel (like I’m sprinting). The average for the whole Apple device was just under 150 BPM. Conversely, the whoop worn on my other wrist Shows my heart rate during the double-unders at between 96 and 120 (Which again is moronic) And my heart rate for the overall workout at 127. Only after I started my cool down and my heart rate dropped did the Apple Watch and the WHOOP come into line. I wonder if the WHOOP is just too imprecise as a piece of hardware so when your heart rate is extremely fast it’s missing beats, I’m just theorizing but it’s disappointing in any event. The AI WHOOP support is also completely worthless. canned responses and useless troubleshooting pages. I don’t know what device to recommend, but if you’re serious about your data, this ain’t it

    **update 8/25.

    I wore my my Apple Watch Ultra and Whoop at the same time today (albeit Whoop on right arm Apple Watch on left) as discussed in the main review below. I set both devices to “functional strength” and then went about my work out. Main part of the work out was 30 minutes. During that time. The whoop registered 241 cals burned and an avg heart rate of 119. The Apple registered 327 cals burned and an average heart rate of 129. I also noticed that during certain periods of the session, the Apple registered my heart rate at 145 bpm and the Whoop 107. I’ve been an athlete my whole life I know what 107 feels like, and I know what 145 feels like. I also at that point timed my pulse and got 140. Not sure if the whoop reflects a high degree of latency (claims it doesn’t) but that reading is way way off. Could also account for the meaningful deviation in calories. I pinged the whoop chat bot to ask. It was useless. Offered a lot of semi science mumbo jumbo about strain calculations. I’m deducting another star.

    I work out daily. Have for the last decade and a half. When I was younger it was conditioning for various combat sports. Now that I’m in my 40s it’s conditioning for the combat sport that is life. I still get after it pretty hard every day, and in the last few years have become interested in tracking biometrics. It started with various Fitbit devices, which were super limited, moving up to the pretty good Garmin instinct solar, to The OK Apple Watch Ultra (you can find my review on here somewhere) And now the Whoop. The reason I wanted to move away from the Apple Watch is threefold (although candidly the device is deeply flawed in general). 1) It’s far too busy, too much going on, too many notifications too much buzzing 2) The battery life sucks (2.5 days max) and 3) I really like watches, actual watches, aesthetically I think the Apple Watch Ultra is just awful. The WHOOP checks all the boxes. It has no screen or buttons, it does not buzz. It is extremely minimalist. It is very lightweight And comfortable. Battery life is about a week, However, in a bit of pretty ingenious engineering, you don’t take it off to charge it. You charge a small battery pack That Whoop wears like a backpack on your wrist. So every few days I just slap that on after my workout the Whoop charges fully in a manner of minutes and we go about our day. The Whoop interface is ok. Its fine. I think there’s a lot of data in there and I’m just getting used to accessing it. I like that it’s sleep and recovery focused. Every day I get a grade for my sleep quality (usually not great) And a related grade level of “recovery” from yesterday. I don’t pretend to know the science behind the recovery statistics, however directionally they are in line with the way my body feels in the morning and throughout the day. The major flaw in the WHOOP design that I have encountered so far in its “strain” calculations. Once you wear the device for a few days It starts to make customize recommendations for how hard you should push yourself physically given your recovery level. That’s fine, Although I tend to just move through my schedule of splits and conditioning irrespective of what the Whoop says. What I have observed though, and it annoys me, is that the calorie calculations are way off relative to every other device I’ve ever used. For a given activity I think they’re probably 20 to 30% low relative to the Apple and 40% low relative to the Garmin. They’re also internally contradictory. Here is an example: today was a conditioning day. I did a pretty hard workout which consisted of timed sets of pull-ups, push-ups, and jump squats. It’s a 30 minute timer. You do seven pull-ups 15 push-ups and 20 squats per minute and then rest the next minute, etc. So you wind up doing the high volume of movements. And your heart rate is quite elevated. My Apple Watch records this session at a bit over 400 calories. My WHOOP records it at 258 calories. I’m not sure which is right, But I will say that the WHOOP has a “strain” score, which is roughly a measure of how hard your body is working during the exercise. Before the exercise “processed” my score 8.2, with a heart rate averaging in the 130s with peaks in the low 160s. When I finish the exercise and added in the movements as prompted by the WHOOP It recalculates the strain score to 16.8. Reflecting the work rate associated with the movements I was doing. So the strain increased to almost double to accommodate the amount of work done during the session. Why did the amount of calories calculated by the WHOOP not increase? Exertion requires thermodynamic energy; my strain went up because I was doing more work, work = energy output= calories. So that is a bit bit silly. Overall I’m still pretty happy and the actual numbers don’t matter, although little sloppy nits like this bother me. Maybe they’ll work it out in a future software release.
    281 people found this helpful
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  • Reviewed in the United States on April 15, 2025
    Fantastic product. I've been wearing every day for 3 months. Great insights. Also, it has made me realize how poor my recovery is whenever I drink alcohol and has basically paid for itself in money saved from drinks.

    I have recommended it to anyone who has asked about it or in the market.
    8 people found this helpful
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  • Reviewed in the United States on April 21, 2025
    I love mine. I got it strictly for tracking my sleep and heart rate but have now learned of many more features that are helping be more attentive. I makes point to journal in the app every night and since having mine, I have been unknowingly watching my health more. The sleep tracker is also the best sleep tracker I’ve ever had, and I’ve had about all of them. All the poor reviews almost had me go a different route (oura ring since got my wife one; but for menstrual tracking I think oura is better from what my wife says) but decided to try it since my Apple Watch is very unreliable and dead before I’m home from work even though only a year old. Needed a tracker specifically for my health and sleep, and this does that. From what I can tell from the poor reviews, it seems those making the comments are either not very technically inclined or just havent taken the time to do the walkthrough of the app. It allows you to customize just about anything. Yes, the first 7 days it will be limited as it’s calibrating but for accuracy it must do that. I was also surprised how much I like the standard band. I forget I’m wearing unlike my Apple Watch. I wear both at the same time all day and keep my whoop on forever since you can charge from anywhere with the battery pack. That’s a pretty cool feature. I would just say…. This is not a $5k medical tracker for serious health concerns, if you’re healthy or relatively healthy this will be perfect for tracking your day to day and night to night. Definitely worth the money. And I have no problem putting in my CC at sign up even with a paid 12m membership, at the end of the day you’re paying for the software of the device and app, that’s where the magic is, not the band and device. It is worth every penny!!!!
    6 people found this helpful
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  • Reviewed in the United States on March 23, 2025
    I'm really enjoying the product and software for my fitness journey. Subscription price feels a little high, but overall I am satisfied. The sub price is the only reason I didn't give 5 stars. I love that I can charge on the go or in the shower, it's really convenient not needing to take the band off. Also, why are the bands so expensive? I want more colors, but not at the price point they ask.
    2 people found this helpful
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Top reviews from other countries

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  • Amazon Customer
    4.0 out of 5 stars Good product and easy to understand
    Reviewed in Singapore on April 5, 2024
    I bought this as a birthday gift for my husband. He is quite happy with the product. How good it is in terms of tracking and performance will only be known after some data is collected and compared with his other device. Hope this will help him understand his recovery patterns after long runs.
  • VikResh
    5.0 out of 5 stars Looks good
    Reviewed in Australia on November 21, 2024
    Coming from the world of Fitbit, that used to malfunction quite often and would be useless. This one is good. The tracking is great and the insights one gets is quite profound. The only issue, if it's even one, is the band. Wish they had a easy way to use the unit. All good otherwise and am quite pleased.
  • Allison
    5.0 out of 5 stars A Game-Changer for Serious Athletes
    Reviewed in Canada on January 22, 2025
    I bought the Whoop band for my 18-year-old son, who plays high-level hockey, and it has truly taken his fitness to the next level. I was skeptical at first—wondering why he didn’t just want an Apple Watch or Fitbit, which track fitness and offer other features—but after seeing the detailed analytics this band provides, I’m blown away. It’s far more advanced than anything I’ve seen with my own Apple Watch or Fitbit.

    One of the coolest features is that it syncs with his teammates, allowing them to compete and compare who worked the hardest during practices and games. It also tracks recovery status, which has been a game-changer—he’s getting more rest now instead of staying out late, and I love that.

    If you have an athlete who’s serious about their fitness and performance, I highly recommend the Whoop band. It’s not just a fitness tracker—it’s a tool for real improvement.
  • Juan Manuel Bernal Santoyo
    5.0 out of 5 stars Un producto innovador y excelente monitor de salud
    Reviewed in Mexico on January 6, 2025
    Es un producto con bonito diseño , calidad , amigable y tecnológicamente superior …excelente soft ware y aplicación .. muy completo en su medición
    Customer image
    Juan Manuel Bernal Santoyo
    5.0 out of 5 stars
    Un producto innovador y excelente monitor de salud

    Reviewed in Mexico on January 6, 2025
    Es un producto con bonito diseño , calidad , amigable y tecnológicamente superior …excelente soft ware y aplicación .. muy completo en su medición
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  • Walter Jacob
    5.0 out of 5 stars Whoop vale o investimento.
    Reviewed in Brazil on April 20, 2025
    Estava indeciso entre a pulseira e o anel.
    Superou todas as minhas expectativas.
    Excelente.

Product Summary: WHOOP 4.0 with 12 Month Subscription – Wearable Health, Fitness & Activity Tracker – Continuous Monitoring, Performance Optimization, Heart Rate Tracking – Improve Sleep, Strain, Recovery, Wellness

From WHOOP

4.0 out of 5 stars, 2,205 ratings

Customer reviews

1K+ bought in past week

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About this Item

  • EVERYTHING YOU NEED IS INCLUDED: Purchase includes an initial 12-month WHOOP membership, 4.0 hardware, Onyx SuperKnit band, and wearable, water-resistant* battery pack. THIS IS FOR FIRST TIME WHOOP MEMBERS.
  • CONTINUOUS MONITORING: WHOOP is a unique wearable fitness device that offers continuous monitoring of physiological data, including heart rate, respiratory rate, resting heart rate, heart rate variability, skin temperature, blood oxygen levels, daily activity and sleep so users can better understand their overall health and wellness status and track their progress over time.
  • PERSONALIZED FOR YOUR GOALS: WHOOP is insight-driven, providing users with clear next steps and a science-backed approach so they can understand and improve their overall health and optimize performance. Track and log your daily behaviors like activity, diet, alcohol consumption, stress levels, caffeine intake and more with the WHOOP Journal. WHOOP then calculates which behaviors help or hurt your sleep and recovery most, making it easier to stick with healthy habits.
  • ON THE GO CHARGING: Get continuous data for days on a single charge with our water-resistant* battery pack that enables you to charge on the go while you wear it.
  • COMMUNITY SUPPORT: WHOOP offers a supportive community of users, including professional athletes and fitness enthusiasts, who share their experiences and insights. This community provides users with inspiration and encouragement as they work to achieve their fitness and wellness goals. Additionally, WHOOP's community provides users with access to expert resources and guidance to help them optimize their health and wellness.

Product Description

Work to improve your overall fitness with the WHOOP 4.0 Wearable Health and Fitness Coach! This women’s and men’s fitness tracker tracks your health and sleep patterns to optimize your health journey. With a 12-month subscription available for new WHOOP members, this tracker includes our high-quality sensors, superknit wristband, a wireless battery pack, and a USB-C cable. We also provide 24/7 support for any issues or questions and a convenient setup guide. Designed to help you personalize your goals, the WHOOP activity tracker for women and men is insight-driven and backed by science to help provide users with clear next steps in their health journey. It allows you to track and log daily behaviors like activity, diet, alcohol consumption, stress levels, caffeine intake, and more, before calculating which behaviors help or hurt your sleep and recovery most - making it easier to develop healthy habits! This is a health and sleep tracker that offers continuous monitoring of physiological data, including heart rate, respiratory rate, resting heart rate, skin temperature, blood oxygen levels, and daily activities so you can better understand your overall health. Whether you’re a professional athlete or just want to be more health conscious, this fitness tracker for activities is designed to make it easy to log and understand your overall health! This health and fitness tracker features a water-resistant wireless battery pack that allows you to charge on the go while wearing it, so you can get continuous data for days on a single charge. With 24/7 health tracking, the robust sensor will always collect valuable data! Plus, this device is FSA/HSA eligible for convenient health monitoring. Always understand your health with the WHOOP 4.0! Product Details: (1) WHOOP (1) 12 Month Subscription (1) 4.0 Sensor (1) 4.0 Superknit Band (1) 4.0 Wireless Battery Pack (1) USB-C Cable (1) Setup Guide Size: 4 inches Color: Onyx

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