Whoop 4.0 is for people ready to commit to fitness

With metrics like strain and recovery, this is not your average fitness tracker.
By Sam Stone  on 
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black whoop strap on man's wrist
Whoop ditches the screen and focuses on fitness metrics. Credit: Sam Stone / Mashable
Whoop 4.0
Whoop 4.0 has a fantastic spread of metrics and coaching offerings, but it's not the best fitness tracker for everyone.
Mashable Score 4
Wow Factor 4
User Friendliness 3
Performance 5
Bang for the Buck 4
The Good
  • A complete picture of your exertion and recovery
  • The app is focused on fitness, not just health metrics
  • No screen means no distractions
  • Built-in coaching is helpful without being pushy
The Bad
  • Confusing, text-heavy interface
  • Charging and battery life are less than ideal
  • Some of the tracking options feel intrusive
  • The accompanying app is kind of laggy

When you start working out, it often feels like the hardest part of making a fitness routine work is finding a way to stick to it. It’s easy to stay motivated for a week — maybe even a few — but eventually the initial sheen of fitness progress starts to fade. It’s that moment, though, that can be pivotal in your fitness journey. Ultimately, the choice to stick to a fitness routine will be up to you, but the Whoop 4.0 puts all the tools at your disposal to make creating and committing to a workout schedule as simple as possible. 

You’ve most likely seen ads for the Whoop 4.0 on Instagram — they’re the sleek posts featuring a fitness band that doesn’t have a screen. Like most products heavily advertised on Instagram, I assumed the product was a lot of chic pictures without much substance, but the Whoop 4.0 packs a hell of a punch. Everything works through its accompanying app, which, yes, does require a subscription (an annual membership is $239). The band records metrics to measure your sleep, your heart rate, your recovery, and your calories burned. It also offers features like a daily journal to track your wellness habits, workout coaching, and a community function in which you can compare progress with others. 

There is a lot to learn about the Whoop 4.0 and the way it tracks your fitness. Essentially, it measures strain and recovery, and recommends a level of exertion based on those scores. Strain is a number between zero and 21 that’s triangulated by several thoroughly confusing factors meant to indicate how hard your body and mind have been working. Recovery, on the other hand, is a number based on the quality of your sleep, determined by a series of biometrics. 

iphone with strain metrics in whoop app
Your strain score represents your body’s total daily exertion. Credit: Whoop
iphone with recovery metrics in whoop app
The recovery score measures how your body is adapting to the stress of training or workouts, lack of sleep, illness, or your menstrual cycle. Credit: Whoop

If this sounds confusing, that’s because it is. The Whoop 4.0 was a great workout partner, but understanding how to use it, and how to digest its metrics was akin to taking the SAT. I read paragraph after paragraph of small text in the app, trying to gain an understanding, only to then watch an explainer video and walk away more confused than when I started. In practice, the fitness tracker isn’t hard to use, but to get a sense of what each metric really means, you’ve got to get deep in the weeds. 

The Whoop 4.0 is different on purpose

First and foremost this thing doesn’t have a screen. That’s intentional, according to Whoop’s website, so that you can focus on performance instead of a watch face. It was actually nice not to have something flashing, buzzing, or beeping on my arm during my workouts, but when I went for distance runs, it meant that I had no way of knowing how far I’d run. I was forced to keep the app open on my phone, which was a bummer.

iphone screen with sleep tracking data
Wearing the tracker at night gives you an analysis of your sleep cycles. Credit: Whoop
iphone screen with stress metrics
Whoop tracks your stress levels throughout the day. Credit: Whoop

The Whoop 4.0 purports to be about a more holistic version of fitness, which is why, in addition to tracking how you put your body under stress or strain it also offers a daily habit journal. If you’re consistent with it, the app will offer insights into how your habits affect your sleep and workouts. I found it helpful to note down things like my diet, how working from home affected my mood, or even check in about if I felt “in control of my life,” though it was hard not to feel at least a little judged by the phrasing. Other habit-tracking options, like the option to notate if I had masturbated that day, for instance, felt downright weird and intrusive — it’s not immediately clear where this data is going, and it felt a bit like talking to a personal trainer who was being uncomfortably nosey.

Some of the differences are better than others

Eventually, I gave in to working within the mysterious confines of the strain and recovery metrics, and I enjoyed it for the most part. If the app told me I should go my hardest during a workout that day, I did, and if it told me I needed to recover I took the day off. It was hard to determine what exactly was a high-strain workout — a Crossfit class that left me literally weak in the knees registered as a 12.3 strain, while a mile run came in at 8.1. 

With the help of the habits journal I began to see the extreme effect drinking had on my sleep quality, which helped me plan my week much more efficiently. I started to notice habits that affected my mental health and how alert I felt as well. I didn’t miss the step tracking, or live heart rate monitoring that many other fitness bands put front and center, because I was, as advertised, much more focused on my workouts. The Whoop, for its part, was a silent companion while I was at the gym, ready to regale me with data whenever I chose to open the app.

The Whoop has a unique charging situation: Instead of plugging in, you charge a battery pack that slides over the device on your wrist. That means there’s no break in its recording data, but it also means that you’re now keeping track of charging two separate things and that the Whoop itself charges at a snail's pace. Whoop advertises between four and five days of battery life, but I found it to be more like three to four days of battery. It doesn’t seem like a big difference, except that competitors are offering closer to a full seven days of battery for devices, and charging a device twice a week is one more thing to think about. 

Is Whoop 4.0 worth it?

This is a fitness band that is built to create a workout routine that will stick. While competitors seem more interested in weaving in movement and activity throughout the day — going for a light walk around the block for instance — the Whoop 4.0 is about building serious, effective, and rigorous workouts that will definitely challenge you. 

Were there a few functional downsides? Sure. The app, through which everything runs, was pretty laggy. Connecting to that band to update metrics took a while, which could be annoying at times. The battery, too, presented challenges. Dealbreakers? Certainly not, but they’re small missteps in design that add up in the user experience. They don’t dim the shine of the fantastic, if not initially confusing, spread of metrics and coaching offerings the Whoop 4.0 features.

How we tested

We tested the Whoop 4.0 because it’s a relatively new, and highly publicized player in the fitness tracker market. The first generation was released in 2015, and the Whoop 4.0 debuted in 2021. Since it takes a decidedly different approach to fitness, it was important for us to put it through its paces and see how it stacks up against competitors. 

The Whoop 4.0 went through three consecutive weeks of testing, wherein it was worn 24 hours a day to record data during sleep, waking hours, and during cardiovascular and cross-training workouts. While the sheer amount of data and its accompanying explanation felt overwhelming at first, once you get the hang of everything, the Whoop 4.0 is very helpful in maintaining fitness. 

Here are a few other points we took into consideration while testing this fitness tracker

  • Tracking and features: The Whoop 4.0 is different than a lot of other fitness trackers on the market, and for the most part this was a good thing. It pushes users to perform at their best and test their limits without feeling intrusive. The habits journal was particularly helpful, although some tracking options featured in the journal felt more intimate than we’d have liked. 

  • Battery life and charging: Although Whoop’s website claims each charge should last up to five days, our testing revealed that it was usually about three or four days between charges. Also, instead of plugging in the bracelet, the Whoop is charged using an external battery pack that fits over the tracker while it's on the wrist. It’s an unconventional way to charge a device, and in the end, it felt more annoying than innovative. 

  • Price point: Most of the Whoop’s cost will be in membership fees, which you’ll need to use the fitness tracker. These fees are $30 for a monthly membership, $239 for a yearly commitment, and $399 for a two-year commitment. While these prices are cheaper than, say, a personal trainer, they are much more expensive than competitors' membership programs. Still, you get what you pay for, and the Whoop’s data feels much more in-depth and training-focused than others on the market.

Mashable Image
Sam Stone

Sam Stone is a freelance writer based in NYC.


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