How fast does your heart beat? It’s a tough question to answer, because our heart rate changes all the time depending on what we’re doing and how our body is behaving. However, ...

Your heart rate is a key indicator of workout intensity. We've rounded up seven of the best heart rate monitors, including favorite models from Garmin, Apple and FitBit.

Heart rate is great for gauging effort during exercise, but wrist-based optical sensors can be thrown off by everything from skin color to the weather, and chest straps—generally considered the ...