That feeling sticks with you for a while too. I had a similar thing after helping my brother move a giant sectional couch up three flights of stairs, and then every little task that week felt like nothing. Like oh, I have to do dishes? Cool, at least it's not a couch. There's something about doing one really hard physical thing that just resets your brain for everything else. I swear it's a real thing, like your body goes into easy mode after surviving something brutal.