With your hands behind your head and elbows wide, put your weight on your right foot and reach your left leg out to the side as you tilt to the right.
Keeping your weight on your right leg, exhale as you draw your left knee toward your left elbow and engage your left side. Return to standing. This completes one rep.
Repeat for 20 reps on each side.
Modification: Break this movement up into two completely separate moves. Keep both feet on the ground while you draw your left elbow toward your left hip 10 times and then stay upright while bringing your left knee up and out to the side 10 times.