She felt his muscles flex as he held her tighter.

A muscle flexed in his jaw, and she could see the effort he was making at control.

Ford saw the muscles flex on either side of West's jaw.

The muscles in his back flexed and rippled as he worked.

He stood up, flexed the muscles in his back.

With each step he ascended, the muscles in his legs flexed.

He pointed the claws downward, and I felt his muscles flex against the side of my body.

A muscle in his jaw flexed as he appeared to bite back a smile.

The ship rocked gently, making muscles flex in a dance with her.

Already Whitney could feel those splendid muscles flexing beneath her.