His muscles contracted but could force nothing else out.

I had to stretch out, or my muscles would contract permanently.

"The doctor said sometimes their muscles will involuntarily contract when they are in this state."

His muscles contracted and expanded in preparation for the change.

His muscles contracted, and a black mist began to descend upon him.

It hurt when the muscle contracted, but there was still ample power.

For example, the muscles of the colon may contract too much after eating.

Spent or not, she kept certain muscles contracted to hold him inside her.

As a result, the muscle cannot contract very well and the patient is paralysed.

These fibers allow muscles to contract quickly resulting in a great deal of power and speed.