This double-duty move works your hip and glute muscles on both the supporting and the working legs!
How to do it: Lie on your right side with your upper body propped up on your right elbow and forearm. Extend your top leg out straight and bend your bottom leg for more support (keep both knees and hips stacked). Place your left (top) hand behind your head. Lift hips and top leg up, lifting your leg just above hip height. Hold for 1 count, then lower hips and leg back to floor. Try up to 3 sets of 20 reps on each leg.