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Physical exercise affects the equilibrium of the internal environment. During exercise the contracting muscles generate force or power and heat. So physical exercise is in fact a form of mechanical energy. This generated energy will deplete the energy
house-of-gnar: Image of a Navy SEAL, taking aim with his M4A1 Carbine while securing a US Embassy for evacuation during excercise Desert Rescue X, June 18, 2002. U.S. Air Force photo by Staff Sgt. Aaron D. Allmon II A US Army Chinook lifts off after
