PNF 0 Proprioceptive Neuromuscular Facilitation (PNF) Stretching technique that uses reflexes and neuromuscular principles to relax the muscles being stretched. Based on a contract-and-relax method. Benefits of PNF. More effective than slow-sustained stretching. An increase in strength of the muscle(s) being stretched. Disadvantages of PNF. More pain. Need for a second person to assist. Need for more time to conduct each session.