Now, there's sience behind this, there's three things that make this happen:
Dopamine: Dopamine is a neurotransmitter which makes us feel energised, motivated and upbeat. High levels of protein containing foods such as meat, milk, fish and beans help produce dopamine. Dopamine is factor in developing and strenghtening coordination and muscle memory. Dopamine makes the brain associate happiness with exercise, your brain will then remember the feeling and will be encouraging your body to do exercise, in order to get more.
Phenylethylamine: An naturally occuring neurotransmitter found in the brain, it works as an mood enhancing stimulant, also aiding in the production of dopamine.
Endorphins: They bind to opioid receptors in your brains neurons, altering the number of neurotransmitters which are discharged. It reduces your central-nervous-systems' ability to receive electrical impulses of your nerves which mean pain, this means your body declines the feelings of discomfort, sadness and pain while working out.
So now you know, exercise is truly the key to happiness, not only will you look great - you'll feel better.


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