: to spread by metastasis â¦ all ten were primary brain cancers; that is, they had originated in the brain, and not metastasized there from elsewhere in the body.âPaul Brodeur, The New Yorker, 9 July 1990.
PNF stretching, or proprioceptive neuromuscular facilitation stretching, is a set of stretching techniques commonly used in clinical environments to enhance both active and passive range of motion in order to improve motor performance and aid rehabilitation.uring the 1960s, the physical therapy departments of several universities began offering courses in PNF and by the late 1970s PNF stretching began to be used by athletes and other healthy people for more flexibility and range of motion.
Other studies show that stretching before or after exercise has little to no benefit. Some research shows that stretching doesn't reduce muscle soreness after exercise, and other studies show that static stretching performed immediately before a sprint event may slightly worsen performance. Stretching can help improve flexibility, and, consequently, range of motion about your joints. 1  Better flexibility may: 2  Improve your performance in physical activities. 3  Decrease your risk of injuries. 4  Help your joints move through their full range of motion. 5  Enable your muscles to work most effectively.