Whoop 4.0 review | TechRadar

Two-minute review

The Whoop 4.0 is the latest health and fitness tracker from tech company Whoop. It looks similar to the Whoop 3.0, which we reviewed in 2021. But there are some notable upgrades, including added sensors to collect more health data (like your blood oxygen level and skin temperature), a smaller design and a vibrating wake-up alarm.

Unlike the current crop of fitness trackers from brands like Fitbit or Garmin, the Whoop 4.0 has no screen or buttons. This design takes some getting used to. Anyone who wants smartwatch apps or workout stats on their wrist won’t like it. But for those interested in health and fitness tracking and nothing else, it might be a welcome break from 24/7 screens.

The Whoop 4.0 is a hardcore fitness device that doesn’t just track steps, gym sessions and calorie burn. Instead, it focuses on recovery. It aims to make sure you feel well-rested, so you’re working at an optimal performance level next time you exercise – that way, you’re more likely to avoid injury and over-exertion.

Whoop 4.0

(Image credit: Becca Caddy)

The Whoop 4.0 presents data about your sleep, recovery levels and how much strain your body is primed for each day. The Whoop algorithm that makes these calculations takes a range of factors into account, including where you’re at in your menstrual cycle, how well you slept last night, your heart-rate variability, your temperature and much more.

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