The Whoop band, like a smartwatch without a screen, can track your exercise and sleep. The included app ($30/month or ...

The Whoop 4.0 isn’t like other fitness trackers, which means there can be a bit of a learning curve when you first begin logging your training and tracking sleep. After three years of full-time ...

Promise. But how did the WHOOP 4.0 stack up when Cosmo put it to the test? From its ease of use to battery life and functionality, we set out to let you know whether the subscription-only device ...