I believe it is called "endorphins" but maybe not. Read up on it. :P
Endorphins
Exercise releases stress as well as endorphins, which in layman's terms can be described as a happy hormone.
its bismut - 20 bilion bilion yrs and from isotopes its Selenium SE-82 (130,000,000,000,000,000,000 years or simply 130 quintillion years)
There are certain endorphins that are released during vigorous exercise. These endorphins are called endogenous opioid peptides. These endorphins are also present in love.
endorphins
The pain-controlling chemicals in the body are called endorphins.
This event caused the body to release endorphins.
The nervous system, especially the brain, produces endorphins.
We feel tremendously good when endorphins are released in our body. Endorphins are neutrotransmitters that are released in the body when we exeercise or feel a great degree of excitement. Endorphins are a type of brain chemicals and they are produced by the hypothalamus and pituitary gland in the brain.
The brain releases endorphins in response to pain. These endorphins are a lot like the man-made pain-killer morphine.
This class of neurotransmitters is called endorphins.