The number one way to beat gym boredom is to get a partner. Just look around your gym for guys who seem to have the same goals, or better yet (and this is what I did) if you have a friend who is out of shape or just not athletic, tell him that you'll be his personal trainer for free. It makes you feel all ego-boosted because you're likely much stronger, and you also get to hang out with a friend. Helping them get stronger helps you get stronger