Four Different ways to Stretch

Stretch Definition
Active Employs repetitive, controlled movements through the range of movement of the joint. Purpose is to prepare joints and muscles for activity.
Static To increase flexibility. Muscle is slowly stretched until it gently pulls and then is held. Does not trigger stretch reflex. Should be felt in muscle belly, not tendons or joint.
Ballistic Causes greater reflex muscular contraction.Used to mimic sport specific activities. Employs rapid bouncing or bobbing motions. Incorporates high force, short duration actions. Should not be used by general population.
PNF Purpose is to increase flexibility. Statically stretching a muscle, isometrically contracting the muscle, and then immediately lengthening it into a greater range of motion. Developed in physio for rehab.