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The More You Move, Your Mood Will Improve
Certain hormones and polypeptides released by the brain, such as dopamine and endorphins are known for their mood improvement qualities. When exercising often, the amount of these substances produced increases, therefore making those less moody. This is attributed the common "runner's high" experienced by cross country runners, leaving them hooked on the sport; eventually these atheletes see a permanent improvement in their outlook.