>>76379389 (OP)You'd think it would be a great idea, but it's not.
In bodybuilding you want more muscles.
The more, the best.
In martial arts, cardio is much more important than just muscle mass.
And here's the problem : More muscles = More Bloodflow = More oxygen required.
So typically, bodybuilders get exhausted very quickly when doing martial arts.
Of course there's a sweetspot, between force, muscle mass and cardio, but wanting to put on more and more muscle as a bodybuilder directly reduces the level of cardio you can achieve.
That's why fighters are fit but are not size monsters.
There's also the fast twitch VS slow twitch muscle fibers problem, but that's for another time.