"Ever wonder what is going on chemically in the body while you sweat it out at the gym? The euphoric feelings during and after exercise, as well as the muscle soreness that might just come a day later, don't just appear magically. Your body is made up of millions of chemical reactions, which result in different physical and mental feelings. Take a look at some of the top hormones and chemicals that are released when you workout."
Via PAT NOVAK