I can't think of a single game that manages to have enemies correspond to your level rather than area or story progression actually contribute to the game. It just makes trying to get better gear ultimately a pointless task because the enemies get strong at the same rate so you might as well stay weak.
that would suck. Why even exercise? someone else who wants to do it will do it and make you stronger. also that would mean every single person is your enemy.
Why exercise? For all of us. You aren't just building your own muscles - you're building our muscles.