Scientists say ‘runner’s high’ is like a marijuana high

That happy, invincible feeling you get when you're floating through the air at the peak of a workout?

You've probably heard that it's something called endorphins that your body produced during prolonged exercise. That idea, which has been around since the ’80s, is based on the theory that these chemicals interact with receptors in the brain to reduce your perception of pain and some thought they may also give you that euphoric boost.