The wearable for the pros lets us mere mortals train (and recover) properly too

The Whoop Strap 3.0 is the third generation of a wearable that seeks to go beyond what your typical fitness tracker or sports watch is capable of.

It wants to hone in on tracking recovery periods in your training or workouts. By doing that, it hopes to help maximise performance for your next big session.
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https://www.wareable.com/fitness-trackers/whoop-strap-3-review-7603