Lay flat on your back and place your hands behind your head

Bend your knees and bring them up so that your thighs and hips form a 90 degree angle, calves parallel to the floor With elbows flared lift your shoulder blades off the floor and hold the position

This is your starting position

Twist your upper body in one direction bringing the elbow to the opposite knee while fully extending your other leg

Hold for a momemt and then return back to the starting position to repeat in the opposite direction.