Answer:
Safe and unsafe stretching can be categorized by the following:
Safe stretching: -starting with a 5-10 minute aerobic exercise
-breathing while performing a stretch
-stretching at a slow pace
-stretching within your personal ability
Unsafe stretching: -beginning stretches on cold muscles
-not breathing through each stretch
-over-exerting yourself to push to the point of pain
-bouncing while in a stretch