He already could feel the muscles of his upper arms trembling.

His muscles trembled as he felt her rise to meet him.

A muscle in the dead man's face trembled, then lay still.

He had to move; the muscles of his arms were trembling under the strain.

His muscles trembled for a moment, then failed him entirely.

His muscles trembled as she stroked her hands over him.

She gave me her hand, and my muscles trembled as if I were about to have a seizure.

Every muscle in her body was trembling and she couldn't seem to find the energy to murmur more than that as agreement.

She could feel his muscles tremble with effort, and felt a pale satisfaction.

The muscles of her legs were still trembling from her run.