Here’s the real reason you get a ‘runner’s high’ after a long run

“…Recent studies in mice suggest that endorphins may have nothing at all to do with the so-called “runner’s high….Endorphins aren’t the only chemicals whose levels increase when you exercise. A chemical called anandamide does too, a September 2015 study in mice and a small 2004 study in people suggested. Anandamide is a type of endocannabinoid, a chemical that’s part of a system that’s in charge of moderating the psychoactive, feel-good effects of marijuana. And unlike cumbersome endorphins, anandamide can smoothly make its way from the blood to the brain.”