Unlike other core moves that can irritate your neck -- we're looking at you, crunches -- this simple, gentle exercise puts you in a tabletop position, and then uses your abdominal muscles to keep you balanced as you slowly move your arms and legs. (Flatten your belly without a single crunch with this super-effective No-Crunch Ab Workout.)
The result: a firm, strong, flat belly without all the strain. And because this is a compound movement, you're also toning your hips, back, and upper body at the same time.
Watch as Pilates expert Erika Bloom demonstrates how to properly perform this exercise.
What do you want to work on -- your belly, thighs, arms, all of the above? We've put together the 5 Best Workouts For Each Part Of Your Body.