If you wear a Fitbit, Apple Watch or a similar wearable while working out, you already know that you have a useful tool right at your fingertips. One especially helpful feature wearables like these ...

Sitting quietly at your desk, watching TV, or lying in bed at night, your heart should be taking it easy – beating steadily and calmly at somewhere between 60 and 80 beats per minute for most healthy ...

A fitness trainer offers a simple tip to determine whether you're burning fat while doing zone 2 cardio — no equipment needed ...

What science (and your own body) can teach you about smarter recovery ...