There are plans for the MC to go to the gym. But it will have to make sense in the story since he had been a shut in video game addict. (Which I personally am privy to that sort of life.) So it will take some time for him to push himself and build up some muscle.
Yeah, the two things aren't exclusive to each other really, there are many videogamers that also have a good physique (as there are many who don't, not arguing there eh).It's not weird for someone who loves gaming to like also to have a decent athletic body not necessarily full with muscles! (I know I do)
I am, for one, a passionate videogame lover while being a powerlifter for many years