Natural , without artificiality
Anthem is a musical composition of celebration, usually used as a symbol for a distinct group, particularly the national anthems of countries. Originally, and in music theory and religious contexts, it also refers more particularly to short sacred choral work(still frequently seen in Sacred Harp and other types of shape note singing) and still more particularly to a specific form of Anglican church music.
Answer:
Melatonin
Explanation:
When you exercise, your body releases chemicals called endorphins. These endorphins interact with the receptors in your brain that reduce your perception of pain. Endorphins also trigger a positive feeling in the body, similar to that of morphine.
Endorphins are only one of many neurotransmitters released when you exercise. Physical activity also stimulates the release of dopamine, norepinephrine, and serotonin. These brain chemicals play an important part in regulating your mood.