This is a lower body hiit cardio workout for busy people. If you don't

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STRONG: Pull Day Lower Body Strong HIIT - 35 Minute

This is a cardio HIIT workout with active stretching that you can do o

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Exercise Vigorously for 4 Seconds. Repeat. Your Muscles May Thank You. - The New York Times

New Plus Workout: 50 Min Lower Body Strength & HIIT Cardio Bursts With Dumbbells & Step, Community