What is PNF stretching?PNF stretching stands for Proprioceptive Neuromuscular FacilitationPNF uses isometric muscle contractions and progressive stretching to develop the flexibility of a muscle. It is usually assisted by a trainer but can be performed directly by the client (depending on the muscle) if more appropriate.The PNF protocol features 30 seconds (or more) of stretching to increase the length of the muscle, and then 10 secs of isometric contraction on the same muscle. This alternation