Ah the plank. My favorite little Ab strengthening move. The plank or the bridge, as it's also called, is better than sit-ups. It works your abs and back.

Get down on the ground like in a push-up position, but on your elbows. Hold for 30 to 60 seconds.

See the gal holding the plank  picture. It is important to keep your tush down -no pitching a tent with butt in the air. That is the wrong way!!

Get off your butt and on the ground and give it a try!