Imagine being pleasantly euphoric with a lower stress level and having less aches and pains, lower blood pressure, and sounder sleep. You can get there without a pill.
Endorphins, endogenous opiates, produce a natural high. They are produced by the central nervous system and the pituitary gland as a response to stimuli such as pain, fear, or stress. Endorphins alleviate the discomfort associated with the exertion of exercise, and can remain elevated for hours and even into the next day.