Finding time for exercise can be a challenge, but what if you only needed four minutes to ignite your metabolism and keep your body burning calories for hours? High-intensity interval training ...

The Norwegian 4x4 workout is a cardio workout, which includes 4 sets of 4-minute intervals where you push yourself to 85-95% ...

From 4-minute workouts to what to choose from a mini-mart, heart docs reveal their advice for those times when you just can't sleep, work out, or eat right.

We all want to stay in shape, but it's easy to get too busy to get to the gym or take that 30 minute run. If you find yourself regularly skipping any kind of ...

Can a 4-minute workout really deliver better—and faster—results than HIIT? As HIIT's popularity soars, sprint interval training, or SIT, is doing its best to catch up.

Build lasting strength in just 5 minutes a day with this powerful morning routine designed for adults over 50.

Nothing screams "leg burner" like a hill workout. Running -- and even walking -- up hills has profound fitness benefits. You'll build strength and power in your quads, hamstrings, glutes and calves.

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.

From 4-minute workouts to what to choose from a mini-mart, heart docs reveal their advice for those times when you just can't sleep, work out, or eat right.