The bottom line: It ain't cheap, but it could be worth it if you want more data about your health and fitness habits.
Whoop Strap 3.0 review: A great fitness tracker for high performers and serious exercise fans - CNET
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EVERYTHING YOU NEED IS INCLUDED: Purchase includes an initial 12-month WHOOP membership, 4.0 hardware, Onyx SuperKnit band, and wearable, waterproof*
WHOOP 4.0 with 12 Month Subscription – Wearable Health, Fitness & Activity Tracker – Continuous Monitoring, Performance Optimization, Heart Rate
I wore the Whoop strap this summer. Here's what I learned. - The Boston Globe
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Whoop 4.0 Strap Review: A Wearable for Peak Performance - Singletracks Mountain Bike News
Whoop 4.0 review: a diehard fitness tracker for people who like pushing their limits
Whoop 4.0 review: only for the elite athlete - The Verge