A trainer explains when you should be using intervals versus reps to clock your workouts

Aaptiv Trainer Kenta Seki explains when to use interval vs repetition training so you can get the most out of every single strength training workout.

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Photo: Getty Images/Westend61

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