HOW: Stand on the edge of a box/step and balance with all of your weight on the leg you want to exercise. The other leg will be hovering off the edge of the step. Slowly lower your hips, lightly tap the ground with your leg that is in the air, and then come back up.
FEEL: You should feel all of the thigh muscles and butt muscles working in the leg that you are standing on.
COMPENSATION: Don’t let the knees cave in or bow out. Be sure to maintain equal weight distribution throughout the entire foot of the standing leg.