Annoyed with jiggly arms when you wave? Back rolls hanging out of your bra? Booty getting softer? This move alone will not solve those problems (psych!) but it most definitely targets those areas to build muscle definition. Pair movements like this with others that get your heart pumping and body burning to work toward eliminating those issues.

This one's killer for the entire backside! The back of the arms, the back, the booty, and the core from front to back.

When you straighten your arms:

- squeeze your shoulder blades

- lengthen your neck up out of your shoulders

- squeeze your glutes

- lift your hips up so your body is in a straight line

Note: I wouldn't recommend this for people who's knees bother them. The reverse plank position can be a lot of strain on the knee joint.