Thanks, Chris. Yes, that gym has large windows all along one wall and it was fairly cloudy, resulting in a big, soft light source. Color balance was a little funky with the mix of natural and artificial light, but I think not so much that it became a problem.
Nice shots Jon. Lousy result but at least you got a couple of good shots of your son so that always makes it better. You mentioned he has good form from the free throw line (and it looks that way here) but only shoots about 50%, not sure of the angle you took that shot from but it looks like he is not square to the basket (especially the shoulders). Hard to tell from a single shot but it may be something to check out. Not being square to the hoop will reduce just about everyone's shooting percentage.
He is a big boy, what year is he in?
Marc There are always two people in every picture: the photographer and the viewer.-Ansel Adams