He was unable to check the motion of his arm.

He signaled with an up and down motion of his arm.

The motion of his right arm, however, was far from sacred.

Only at a motion of his arm they rose from their knees and stood before him.

She finished fourth and found that her arm motion had changed.

I have the short, quick arm motion of a quarterback.

I think those arm motions are meant to indicate swimming.

There is disagreement in the drum community regarding how much arm motion should be used.

His arm motion does not look familiar to me when he's firing it up.

It moved slightly with the motions of her arm.