Or try this. It's called a plank. To stay steady, you're forced to flex your abs. For maximum benefit, each routine should only be done for a few minutes at a time. Dori Ricci It's really not ...

You'll brace and flex your abs to build them up—while working against resistance to make them stronger, too. Give this ...

Start lying down on your back. Drive your lower back into the floor by flexing your abs, eliminating any space between ...