4.0

Whoop is an incredible sleep tracker and health monitor that does an excellent job of putting you in tune with your body's rhythms.

The Whoop 4.0 provided incredibly insightful evidence of things that affected my sleep, recovery, and ability to perform — both negatively and positively.

The Whoop 4.0 is a comfortable, data-rich wearable that excels at sleep and recovery tracking, but its subscription cost and occasional inaccuracies may limit its appeal.

While Whoop 4.0 shows substantial improvements in workout accuracy over its predecessor, its recovery algorithm remains questionable and doesn't always align with how users actually feel.