Make sure you hold the board flat by using your stomach muscles.

Under the suit I could see the muscles of her stomach.

Needs to use his or her stomach muscles to help with breathing.

My stomach muscles were up to it, but I didn't want to lose any more teeth.

The flyer can support herself, if she has strong stomach muscles.

She had never before realized what a strain that put on her stomach muscles.

In 1994, she won her second world title with a strained stomach muscle.

His stomach muscles drew up and tight, telling her what she needed to know.

Uses his or her stomach muscles more than normal to help with breathing.

When he did a double take, her stomach muscles tightened.