Whoop is a performance optimization system for elite athletes and teams.

Health tech company Whoop, which makes fitness-trackers like Fitbit, gives its straps to users for free. Instead, it charges a membership fee.
On the heels of Google buying Fitbit for $2.1 billion, another player in wearables and health technology has picked up a big round of growth funding to continue expanding its business. Whoop, which makes a sensor-equipped (and screen-free) strap that continuously tracks your activities 24/7 and...

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