Another mind/body revelation-
Researchers have been looking for reasons to explain the high that runners get after strenuous exercise. Neuroscientists have found that endorphins have a playmate—the endocannabinoid system is also responsible for these feelings of: “pure happiness, elation, a feeling of unity with one’s self and/or nature, endless peacefulness”, and “inner harmony”. The endocannabinoid system was first discovered by scientists trying to figure what why people smoke marijiuna. To read more, go to the NYTimes link
http://well.blogs.nytimes.com/2011/02/16/phys-ed-what-really-causes-runners-high/?src=me&ref=general