whoop

Whoop:
Bracelet that tracks heart rate and heart viability. This is appealing to many athletes because it can track how hard you are working and compare this to previous workouts. However, it can also be used at night to test your resting heart rate, which is also a good measure of someone’s fitness level.
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The Whoop strap continuously measures your heart rate. However, instead of just recording the heart-rate, which is an average, is measures the time between each heartbeat (heart rate variability). I’m not an expert on the science behind it, but it’s generally thought that the healthier you are, the higher your heart rate variability (your heart can react faster to changes). Whoop uses this data to tell you how hard you worked out and how tired you are. Lebron James and Michael Phelps both use it, as do a multiple of Harvard teams.
http://whoop.com

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