Whoop 4.0

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Whoop 4.0

Whoop

$239.00

Whoop 4.0

Whoop is how athletes track their fitness and recovering using HRV. HRV is "heart rate variability", or the difference in time between heart beats measured in milliseconds. Generally the higher (relatively to your own "normal" HRV), the better. The Whoop can also track your sleep and overall exertion from workouts.