1.   Lissa felt her stomach muscles tighten, and turned away.

2.   As the stress level increases, they say, the muscles tighten and the amplitude of the microtremors decreases.

3.   As you do them you should be able to feel your chest muscles tighten.

4.   But Danthebluegrassman was a late scratch early Saturday after the colt tied up, or got so nervous that his muscles tightened after a morning gallop.

5.   By measuring electrical activity in their leg muscles, the researchers found that muscles naturally tighten to help dampen vibrations in the surrounding tissue.

6.   California was forced to play without its second-leading scorer, the senior Thomas Kilgore, whose bruised left thigh muscle tightened Thursday night.

7.   Even my fanny muscles have tightened up to where I almost bounce when I sit.

8.   His muscles tightened as he talked about life on the streets.

9.   His jaw muscles tighten and his knuckles get white if he thinks something or someone is slowing him down.

10.   I slimmed down, and my muscles tightened.