The Undisputed Best Ab Moves, According to Pilates Instructors

Mat-certified Pilates instructor Liz Chen recommends this challenging Pilates ab workout move to improve your core stability. If you want to turn it up even more, she says, "do this while raising one leg an inch off the ground, then the other leg." You can try this Pilates ab exercise in a high or low plank position.

1. Start in an elbow plank position.
2. Keep your back flat — don't let your hips droop or lift up. Picture your body as a long straight board, or plank.
3. Maintaining this position, pull your body forward, shifting your weight forward onto your toes and forearms.
4. With control, shift your weight back to the starting position. That's one rep.