How to: Lie on back with hands behind head. Lift shoulder blades off mat, raise legs so knees are bent at 90 degrees, and gaze at thighs, keeping neck relaxed. This is your starting position. Engage abs and rotate right elbow toward left knee while extending right leg to straight, lowering it as close to the floor as possible without resting it on mat. Return to start and repeat on the other side. That’s one rep. Complete 10 reps. Continue to the next move.