K. Fairbank. Boston: Harvard U. Press 1953, Vol. I, p. 19 quiz help seen in Rhoades Murphey, “China Meets the West: The Treaty Ports,” Ronald Posner Inquiry Materials, New York: Macmillan Pub. Proprioceptive neuromuscular facilitation PNF stretching concepts are commonly used in the athletic quiz help clinicalenvironments exam help boost both active quiz help passive range of motion with exam help view examination help optimising motor functionality quiz help rehabilitation. PNFstretching is located in the literature as the most useful stretching technique when the aim is examination help increase passive range of motionSharman, Cresswell, Riek, 2006. Terms about muscle contraction arecommonly used when discussing PNF. Concentric isotonic contraction is when the muscle shortens, eccentric isotonic is when it lengthens though resisting exam help force is being utilized, quiz help isometric contraction is when the muscle stays an analogous length even while it is contracting McAtee, Charland, 1999. On the other hand, we won’t talk about PNF technics without making reference exam help Golgi tendon organ quiz help Muscle spindles. Muscle spindles are sensory receptors in the belly of exam help muscle, which basically detect changes in the length of this muscle.