Someone pointed out earlier that the one time we saw a gym in the game that it was in fact Dawe's families gym that had been mentioned in dialogue. Someone else replied to that post that IT WAS NOT Dawe's families gym because bullshit reasons that aren't supported by any information that we have been given in game.
In Germany, every primary school even has its own sports facility.
If the fitness center is on B&R premises, B&R owns it.
Okay, maybe B&R rented it to Dawe's parents.
But it still remains B&R property.
Also, as far as I've seen, only students (HOTs) trained there.
And as a student you are lazy and don't go to a fitness center which is maybe 5km away if you have a fitness center around the corner.