Good CrossFit Pittsburgh gyms will monitor athletes at all times to make sure that intensity doesn't kill those consistent mechanics. We often stop our athletes and remind them how to move properly. We start this in the controlled Fundamentals Program environment and continue it into our regular CrossFit class. Those who get hurt in CrossFit, and give us a bad name, try to add this element of intensity before worrying about consistent proper movement.
https://ifitransparencyresource.org/best-recipe-for-safe-crossfit/