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One of the main reasons why you generally feel more positive post workout is the result of your body releasing a bunch of happy hormones called endorphins. But it’s not as simple as that. When you work out, the physical activity your body experiences results in stress, which leads to the fight-or-flight reflex. When this happens, your brain releases endorphins that fight the feelings of stress, as well as a protein called BDNF, which protects your brain from that stress.
Endorphins are somewhat similar to morphine in terms of the effects that each can have on your brain. But of course a healthier option. The hormone activates certain neural receptors that reduce discomfort. The key to all of this, though, is the relationship between stress and endorphins as you only get that euphoric release if your body is under enough stress. This means a higher level of working out will result in a higher amount of endorphins released thus leading to more good feelings at the end of your sprint.