[Raymond]

Originally Posted by Swimming/Diving rules

In addition, the committee, in editorial action, changed the term "motionless" to "stationary" in directions to officials for starts. Oakes said this revision was made to reflect more accurately what officials should observe at the start.

"By using the term stationary, a competitor cannot be disqualified by a twitching hamstring, something he or she can't control, but continues to not allow movement by the swimmers once in the starting position," Oakes said.

I wonder if anyone with Tourette's ever challenged this rule.