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

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

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A 19-Minute HIIT Workout for Beginners - The New York Times