A new study has found out why working up a sweat is so relaxing and mood-boosting. Exercise actually detoxes harmful chemicals from the body and can alleviate depression. Researchers at the Karolinska Institute in Sweden have discovered that physical activity purges the blood of a substance which accumulates during stress and can be harmful to the brain.
Previous studies have suggested that people feel more positive after exercise because it releases a rush of endorphins.
But it now appears that during exercise, the muscles begin to act like the liver or kidneys and produce an enzyme which clears out a molecule linked to depression.
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