PNF is an acronym for Proprioceptive Neuromuscular Facilitation . PNF is not really a type of stretching but is a technique of combining passive stretching and isometric stretching in order to achieve maximum flexibility. PNF was originally developed by a physical therapist as a method of rehabilitating stroke victims. PNF consists of a muscle being passively stretched, then contracted isometrically against resistance while in the stretched position and then being passively stretched again through the resulting increased range of motion. PNF usually employs the use of a partner to provide resistance against the isometric contraction and to then take the muscles through its increased range of motion. Read More: Introduction of Stretching , Benefit of Stretching , Element of Stretching , Types of Stretching , Ballistic stretching , Dynamic stretching , Active stretching , Passive (or relaxed) stretching , ...
Isometric stretching is a type of static stretching (meaning it does not use motion) which involves the resistance of muscle groups through isometric contractions (tensing) of the stretched muscles. The use of isometric stretching is one of the fastest ways to develop increased static -passive flexibility and is much more effective than either passive stretching or active stretching alone. Isometric stretches also help to develop strength in the "tensed" muscles (which helps to develop static-active flexibility ) and seem to decrease the amount of pain usually associated with stretching . An example of using a partner to provide resistance would be having a partner hold the leg up high (and keep it there) while an attempt is made to force the leg back down the to the ground. Read More: Introduction of Stretching , Benefit of Stretching , Element of Stretching , Types of Stretching , Ballistic stretching , Dynamic stretching , ...