Speaking of workouts, the heart rate monitor is waterproof down to 30 meters so you can swim ... Top features of the Oura Ring: The ring is comfortable enough to wear all day (and all night) for 24/7 ...

You might be hooked up to the monitor only as long as you're in the hospital. But telemetry monitors can be used to gather data on your heart for up to 30 days.

The interior of the waterproof band (up to 30 meters) even features silicone ... their resting heart rate throughout the day. Others need heart rate monitoring for sleep-tracking purposes.

When used correctly, the best heart rate monitors can help you unlock a new level of athletic performance, no matter whether you're cycling, running, or performing any other endurance sport.