Step with Rear Leg Lift

Start: Stand with your feet hip width apart, shoulders back, and arms at your sides.

Movement: Step forward with your left foot, bending your left knee and shifting your weight onto your left foot. Straighten your knee and stand on your left leg, squeezing your glutes to lift your right leg as high behind you as you can without feeling it in your lower back, while bringing your arms straight overhead, elbows by your ears. That's one rep. Do 15, then switch legs and repeat.

Tips: To make this move more challenging, hold 2- to 5-pound dumbbells in both hands as you do the exercise.