Level 1: Sit with your feet on the ground in front of you.
Level 2: Repeat exercise with your feet off the ground and knees bent at 90 degrees.
Level 3: Repeat exercise with your legs straight and held at a 45-degree angle off the ground, keeping your body in a V position.
Routine: Begin in a standard sit-up position. Keeping your back straight and stomach tight, lift your upper body to a 45-degree angle. Holding this position, rotate right to left and back, six times each side. Return to lying flat on the ground. This is one set.
Reps: Three sets of 12 to four sets of 20