Some things you need to consider if you're getting to a plateau in your training. "Change it up"! Tempo : Time under tension how fast or slow you go. Range of motion: Full & partial repetitions Position: Open chain or closed chain exercise Weight: ...What % of your maximum lift are you working at & why?
Press ups are an easy exercise to fall foul of being boring look at the slides & try this next time your in the gym or add something else to the mix by following the suggestions above.