This exercise improves balance and leg strength.

Steps:

1. With your upper arms at your sides and elbows bent, hold your forearms out in front of you with your palms facing the floor.
2. Lift one knee up to waist level toward your palm, then lower it.
3. Repeat on the opposite side with your other leg.
4. Keep marching in place for 20-30 seconds. Try standing on a cushion while doing this for an extra challenge.