A good way to maintain a balance is to pull : push at a ratio of at least 2:1. Meaning you should be pulling (rowing, chinning, etc) at least 2x as much a pushing (pressing, benching).
We're already internal beings by nature. Most of us anyways. We do everything in front of us. Sit at the computer, drive, stare at our phones/laptops. We're internally rotated all day. Then we go to the gym and hammer bench presses, overhead presses, pushups. That exacerbates the hell out of the internal rotation we're already stuck in all day. It creates a massive imbalance if your not counteracting it with more posterior work (squatting, deadlifting, rowing) to maintain a balance. And if you don't balance that, it leads to all sorts of compensation patterns that will f**k up your shoulders and back royally.
And even beyond that, you should be training opposing movements to keep balance. Overhead press/pull down, pullup; flat bench/horizontal row.
I wish I knew this like 5-10 years ago.