Stand on a 6-12 inch box with your feet hip-width apart. Shift your weight onto one leg, allowing the other leg to hover just off the edge of the box.

Hinge at your hips and bend the knee of your standing leg. Slowly lower the opposite heel toward the ground, keeping your chest up and your hips level.

Lightly touch the heel of your lowered leg to the ground, then press through the heel of your standing leg to return to the starting position. Keep the movement controlled. Repeat on the opposite leg.