6 Low-Impact HIIT Workouts That Won't Hurt Your Back, Knees or Ankles

High-intensity exercise doesn't need to be high-impact. Here are six low-impact HIIT workouts that'll burn serious calories and build muscle — no jumping required.

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Why You Should Do Outdoor HIIT Workouts

Body-Weight HIIT Workout You Can Do With No Equipment

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My Inner Thigh Muscles Hurt and I Can Barely Walk After Exercising

Body-Weight HIIT Workout You Can Do With No Equipment

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A 20-Minute Beginner HIIT Workout for People Over 50

Week 3 of the 4-Week Plank Challenge: 7 Plank Variations, Including Reverse Plank and Plank With Hamstring Lift