Love data but hate wristbands? Meet the fitness tracker you can attach to your clothes

The data-gathering wearable is now 33% smaller and comes as part of Whoop's digital membership

The Whoop 4.0 fitness tracker, shown in four different color options - blue, white, pink and neon yellow
(Image credit: Whoop)

Whoop, the fitness tech firm, has launched the latest iteration of its flagship screen-less fitness tracker - and it could be perfect for anyone who hates wearing a wristband-style device.

That's because the Whoop 4.0 comes with the company's Any-Wear technology, so you can strap it to other areas of your body or store it in your workout clothes. 

If you already own one of the best fitness trackers, you'll know how valuable and actionable this logged data can be, especially if you're working towards achieving a personal best during a run or strength training workout. 

However, Whoop's devices are different. Rather than coming with smartwatch-style features, like a screen and notification mirroring, the Whoop 4.0 is a solid device you'll never have to glance down at. 

Instead, the fitness tracker is focused solely on gathering data to sync to your smartphone. Notably, you don't even have to buy the physical device, as it comes for free as part of Whoop's health and fitness subscription offering. 

Alongside the new wearable, the company also launched a range of workout clothes to securely house your new fitness tracker. This seems to be a big part of the tech company's business plan, building a complete fitness brand centered around the newly invisible Whoop tracker. 

According to the company, the Whoop 4.0 is 33% smaller than its predecessor and comes with 5-day battery life. This is an impressive feat, as the tracker has five LEDs and four photodiodes on the underside to gather data and now offers haptic vibrations to help you wake up at the optimal time. 

Once you've got the tracker strapped on or tucked away, you can track your heart rate, skin temperature, blood oxygen saturation, and respiratory rate. You also get access to other features, like WhoopLive, which allows you to record your workout and overlay your workout stats. 

Despite this unique take on the fitness tracker, Whoop does have competition. When the world shut down due to Covid-19 restrictions in 2020, many fitness companies launched digital services, so Whoop will have to find a way to keep its membership worth the $18/month cost. 

Still, Whoop's latest ventures are undoubtedly exciting and a break away from more traditional fitness wearables like the best Fitbit devices or the best fitness watches.

James Frew
James Frew

James is a London-based journalist and Staff Writer at Fit&Well. He has over five years experience in fitness tech, including time spent as the Buyer’s Guide Editor and Staff Writer at technology publication MakeUseOf. In 2013 he was diagnosed with a chronic health condition, which spurred his interest in health, fitness, and lifestyle management.


In the years since, he has become a devoted meditator, experimented with workout styles and exercises, and used various gadgets to monitor his health. In recent times, James has been absorbed by the intersection between mental health, fitness, sustainability, and environmentalism. When not concerning himself with health and technology, James can be found excitedly checking out each week’s New Music Friday releases.