If you are not familiar with what a “Runner's high” is, it's when someone gets a euphoric feeling that comes after a prolonged work out. This is caused by the release of endorphins (natural pain and stress relievers). Surprisingly, it's a real concept! So, if you feel like you just want to explode with happiness (or maybe you feel a little bit high) during your next work out, now you know why!

And the best part is, this sort of high is legal all around the USA (and World too) – Time to work out!