As someone who loves to sing (regardless of whether I'm good or entertaining) and does it regularly, my last hospital stay they showed up with this breath measuring thing (big plastic thing with a chamber that showed capacity and then a gauge showing the level and they insisted I'd have to do this thing before and after surgery and then 5 times per hour to make sure my lung capacity was good. Whatever. I blew into it and it went up to the top and then I stopped. She said, no..... see that range in the middle? Uh huh... keep it at that level for x amount of time. So I did my singing breath and blew........ kept that thing in the range for a super long time and finally she said, "Okay, that's good don't worry about it any more...." and no one tested me again. Now i'm sure my insurance was billed for the plastic thing they used and I doubt they use them over. What a waste but yeah.... singing is good for lung control and for breathing. So he's already ahead of the curve.....
I did the same thing during my surgery - the point of that "breathing" exercise to avoid getting pneumonia, i.e. keepng your lungs clear while you are laid up. It's an "incentive spirometer".
I'll tell you, I'd do that breathing thing all day rather than those crazy "leg pumps" they put on your legs to avoid blot clots. So f***ing annoying!
"Let me out of here!" was my daily mantra...
walrus