all-the-gory-details three-year review of the Whoop 4.0. Let's start with the physical attributes and the important bit of the Whoop 4.0, which is the small black sensor pod that houses all the ...

27, it's just $5 away from its best price ever. That's 50% in savings. The Whoop 4.0 is one of our favorite fitness trackers on the market — particularly for sleep and recovery tracking.