I did something to my ab muscles.

It felt like the ab muscles connected to the hip bone pulled out.

Using your ab muscles, pull the ball back toward you.

These moves hit every major ab muscle.

Challenge all the layers of your ab muscles with just one pose.

It targets those hard-to-tone lower ab muscles that are crucial for a firmer belly.

You need to work all of your ab muscles (not just the big central one) to get a truly tight middle.

If you don't lose the belly fat, he says, you won't see the ab muscles.

One sequence: Contract and release the ab muscles for three minutes straight.

After-burn: Want to really show off your gorgeous new ab muscles?