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

Besides tracking your sleep, the Whoop can also track activity—although, as I noted above, it’s not as accurate as some of the more traditional gadgets. (If you really want the most accurate heart ...

The WHOOP 4.0 is water-resistant for up to approximately 32 feet for two hours. Or, in simpler terms—you can shower in it, but you shouldn’t go scuba diving in it. The fabric strap will absorb water ...

However, Whoop’s insights are slightly more detailed. The photodiodes on the underside of the strap stay pressed against your skin and track heart activity and breathing patterns to create ...

But the best heart rate monitors aren't all created equal. For cyclists, the most popular are chest strap heart rate monitors, which, at their most basic, need to capture your beats per minute ...