Whoop 4.0 Band 12-month Membership $199. A 24-month membership is $359.
Whoop rarely goes on sale, so this is probably as good as it gets.
Whoop is a fitness tracker that measures strain, recovery, and sleep. The Whoop 4.0 strap records your heart rate, heart rate variability (HRV), blood oxygenation levels, breathing rate, and skin temperature throughout each day. It also tracks all four stages of sleep — slow wave sleep (SWS), REM, light, and awake — with very good accuracy. For me personally, sleep tracking and HRV tracking are the most useful features.
https://join.whoop.com/en-us/select/membership
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