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Gym-goers spend hours on stair-climbers, but you can get a better workout, faster, with step-ups. Go up and down quickly and drive your knees up to get the maximum burn.
How to do it: Place one foot on a step and push down through your heel to lift your other leg up. Return to the starting position and finish all reps with one leg before switching legs and repeating the exercise.
Watch video for demonstration:)