I've done a fuckton of drugs, drank all the booze, gotten a fair amount of ass, shot all sorts of guns, rode motorcycles, etc. and I have to say that there are amazingly good feelings that you get from exercise and being in shape that you cannot get any other way. Like Arnold said in that documentary when he flexes it feels like cumming, it doesn't exactly but it does feel amazing to have muscles.

More than that, human bodies are supposed to run and be used. Running is good for the brain. I run and feel like an animal, I'm out in the world and it's just me and the world and no phones or other bullshit. I can't describe it, you have to do it to understand the freedom that you feel while running around when you're in shape.