This gnarly crunch zones in on your obliques and helps whittle your waist.
- Lie on your back in crunch position, knees bent, fingertips holding base of your head for support.
- Lift your head and shoulder blades off the floor, as you bring your knees in toward you chest.
- Rotate your feet to the left and extend your legs.
- Return to center, lower to starting position, and repeat on the opposite side.