10 slow reps, 8 fast reps
Lie on your back with your abs engaged, legs in tabletop (knees bent in line with the hips, shins parallel to the floor), hands behind the head for light support.
Exhale and crunch up, twisting from the waist to bring your right elbow towards your left knee as your opposite leg extends.
Inhale and return to center, keeping shoulder blades lifted.
Exhale switch sides to complete one rep.