The Whoop 4.0 launched in late 2021 and is available now. But you can only get one with a Whoop membership. A membership costs £30 / $30 / $44AUD if you want to pay monthly without a big commitment – although this option comes with a six-month minimum term. Signing up for annual membership works out at $24 / £24 / AU$32 per month. The catch is you ...

The main body of the Whoop 4.0 is small and rectangular, with a plastic casing. This is where the battery is housed, and the sensors are on the underside. This then clips onto an elasticated fabric strap. We found the overall look and feel of the Whoop 4.0 to be minimal and unobtrusive as it sits flush against your arm, and there’s no screen or but...

The Whoop 4.0 tracks a lot of data, focusing on three key areas of your health and fitness: recovery, sleep and strain. It then offers feedback about how much you should be pushing yourself each day through the Whoop app. Your level of recovery and exertion (called strain) scores are worked out based on several factors, including your workouts, how...