100 laughs equal the energy expended in 10 minutes of rowing. Laughter can increase healing and relieve pain. (Edell, Dean, MD. Eat, Drink & Be Merry. p 128-129. NY: HarperCollins, 1999.)
Research: Laughter is one of the best ways to discharge constricted emotional energy. (Lipton, Bruce, PhD. The Biology of Belief. p 196-197. CA: Mountain of Love / Elite Books, 2005.)
Refer to Energy and the Brain for additional information.