Everybody knows that exercise is good for you. Some of the people who are not too lazy to exercise have experienced it for themselves. You start your day feeling down and unmotivated, go out for a run even though that was the last thing you wanted to do, and come back home fresh, full of energy, and happy once again. However, what is it in sports and physical activity that does the trick and flips the happiness switch in our brain? Ever since this phenomenon was first noticed, science has…

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