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Others tested the blood of subjects after strenuous exercise and discovered lots of endorphins, which are also produced by the adrenal glands, Raglin said.

Researchers have found that high-intensity interval training prompts a rise in the release of endorphins in the brain, compared with less intense exercise.

Nor are endorphins the only substances that respond to exercise. For example, exercise can prevent serotonin being taken back up by brain tissue, just like some anti-depressant drugs.

Endorphins are feel-good chemicals that have several benefits. For happier days, consider starting your mornings with exercise, laughter, and more.

The Opinion Pages When Exercise Is Driven by Fear Instead of Pleasure Diane Israel is a psychotherapist and psychology professor at Naropa University.