How do people level up so fast?

lol it would drive me insane sitting on maple playing consistently for more than a couple of hours. I used to do 4 hours max, but even then, I'd need to get off my ass for a little while because i'd get hungry or sore. Not to mention the eye strain. But i pretty much break all sanity at around 1-2 hours now. Training gets repetitive and i get bored (which is how i end up doing quests after a while to cool off).