This Video shows what can happen if you do not apply safety rules to exercising:
General Statement
With the current interest in safety in the United States, the safe conduct of a sport like gymnastics is very essential. It is a basic assumption here that gymnastics can be conducted safely. To make safety a reality students and teachers alike must be alert. Teachers must explain hazardous qualities of every stunt, and students must take their role as spotters seriously. Every participant can have fun, but no particip...