Proprioceptive neuromuscular facilitation stretching, is a particular method of stretching commonly used in the sportive world and also within a clinical type environment. Proprioceptive neuromuscular facilitation is commonly referred to as PNF. PNF is considered a very beneficial stretching method, incorporating both an active (patient assists in the movement) and passive (patient relaxes in the movement) range of motion, with the aim of increasing resting and active length of muscles. PNF technique is also often used with the intention of improving motor performance and aiding rehabilitation. PNF can be used to supplement daily stretching and to make quick gains in range of motion. Many athletes and non athletes, after experiencing the positive and rapid effects of this stretching technique, often request it as part of their exercise and rehabilitation program.