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The Loop is meant to be worn 24/7, tracking your sleep as well as activities. That means it needs to be comfortable and look presentable, and I think it succeeds on both counts. The physical design of ...

The Polar Loop (Gen 2) is a solid piece of hardware, but it's by no means a straightforward subscription-free alternative to Whoop. That might be the case for some existing Polar watch users craving a ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Add as a preferred ...