Endorphines affect happiness. Their release causes the sensation of feeling good (a natural high).
The 'rush' the body gets from the release of endorphines caused by the exercise. Runners that have to miss their workouts often suffer withdrawal symptoms.
Endorphines
He did. Self-inflicted wounds are believed to cause a release of endorphines (feel good chemicals) that can bring about a sense of well-being, and is usually practiced by adolecents.
Cutting Loose - 2010 was released on: USA: 2010
Cutting History - 2009 was released on: USA: May 2009
endorphines
Smiling and laughing releases endorphines in the brain. These make you feel good and well.
Cutting Out His Nonsense - 1919 was released on: USA: 7 December 1919
Cutting Up - 1928 was released on: USA: 10 February 1928
Cutting Edge - 2011 was released on: USA: 7 September 2011
When someone catches their "second wind", it usually refers to a runner who has been running for long enough so that their body releases endorphines, otherwise known as "runner's high". These endorphines give the person much more energy than they previously had.