The Whoop 4.0 fitness tracker measures SpO2, pulse and more as a bracelet or in special clothing

Whoop has revised its in-house fitness tracker, making it 33% thinner while adding several features. The bracelet will be optional in the future too thanks to Whoop Body, a clothing range with an integrated holder for the fitness tracker. Whoop remains a subscription-only service.

Whoop has announced version 4.0 of its eponymous fitness tracker.

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