What is heart rate variability? Here’s everything you need to know about fitness’s buzziest metric

What is heart rate variability? Doctors explain what you need to know about the health metric, and why keeping track of it is important for your health.

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Photo: Getty Images/Credit:<br />AsiaVision

If Your Fitness-Focused New Year’s Resolution Isn’t Working, Try These 5 Expert-Backed Tactics

New Year's resolution not working out for you? Don't stress. Try these five New Year's resolution alternatives backed by experts.

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Photo: Stocksy/ZQZ Studio

4 Beginner Treadmill Workouts for When It’s Too Cold to Get Your Steps Outside

Can't get your steps in outside? Don't worry: Try one of these expert-backed beginner treadmill workouts instead.

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Photo: Stocksy/Bo Bo