Whether you choose to work out outside or inside, these stair exercises can be done any time—all you need is 15 minutes.
My favorite 15 minute stair stepper workout to burn maximum calories
You Can Do This 15-Minutes of Stair Work Out at Home
You Can Do This 10-Minute Workout at Home With No Equipment - The New York Times
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Pin by Becky Williams on Workout Stairs workout, 15 minute hiit workout, Cardio workout
A 15-minute full body HIIT workout — no equipment required