I don't know. I do know that sometimes on runs - usually long runs - I'll be somewhere down the road and know that I should be hurting. That I'm 10 miles int

I don't know. I do know that sometimes on runs - usually long runs - I'll be somewhere down the road and know that I should be hurting. That I'm 10 miles into a 15 mile run and my feet should be hurting. My legs should be aching. But for some reason it doesn't. For some reason it's all I can do to not just start sprinting. It never lasts and I wouldn't really describe it as a high. Closer to an out of body experience I think.