How to do it: Stand next to a chair with your left hand on it, right hand on hip, and toes of your right foot pointing straight ahead. Raise your right leg so that the knee is bent at almost 90 degrees. Hold for 5 to 10 seconds. Tighten your buttocks and rotate your knee out to the right; keep hips facing forward. Hold for a count of five. Return to the starting position and repeat five more times. Switch legs.
What it does: The added motion of the leg swinging out to the side forces you to activate your core and gluteals.
Make it harder: Add even more motion. As you lift your leg forward, extend and raise your arm on the same side so that it’s parallel to the floor and directly over your knee. As you rotate your knee out to the side, let your arm follow, keeping it in line with the knee.