: 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.
Photo Credit Wavebreakmedia Ltd/Wavebreak Media/Getty Images. Stretching improves flexibility and makes up an important part of an exercise routine. However, not all people stretch before exercise, so you may be wondering if stretching is important. Not all types of stretching are equal, so the type of stretches as well as the timing makes a difference in flexibility and exercise. If your current stretching routine doesn't appear to improve overall flexibility, then you may want to consider making some changes.