That doctor does not really know what he is talking about. He may be confused about sub-concussive impacts suffered by football players and some hockey and soccer players. Cheerleaders are at high risk for true concussions with the tossing moves and falls during practicing new moves.

But, there is no way to predict whether falls or jumping around cause any specific individual to sustain damage. Different people have different tolerance.

Walking causes vibrations to the brain. Going down stairs causes even stronger vibrations to the brain that would be similar to what cheerleaders experience jumping. The brain can tolerate this.

Why do you want this information ?