Lie on your right side, head supported by your forearm, right leg bent at a 45-degree angle and left leg straight. Place your opposite arm on the floor for stability. Lift left leg to about hip height and repeat for reps.
Then, bend your left knee and rest it on top of pillows for support. Straighten your right leg and lift it as high as possible for reps [shown]. Switch sides and repeat for reps.
Strengthens: Core and inner thighs.