Stand in front of a bench, box, or sturdy chair. To make this move more challenging, hold a 5- to 15-pound dumbbell in each hand.
Place your right foot on the bench, box, or chair. Straighten the right leg to lift the left foot off the floor and place in gently next to the right foot. Or for a more intense variation, lift your knee up (as shown in the photo).
With control, lower your left foot back to the floor, landing softly, as if you're stepping onto a pin cushion. This will ensure that you're using your right quad and glutes.
Complete 10 step-ups on the right side, and 10 on the left for a total of 20 reps.