It certainly is fun to look down on these spaces (as I like to do from the track in the gym I use), but my biggest concern about the final design is the decision to put most of the functional spaces below ground in order to achieve that effect. Keep in mind that this means that every piece of equipment has to be taken down to that level, and all the people participating have to go up and down on a daily basis. It is more common to find facilities like this where most of the gym space is on the ground level, and then its the track and some other support spaces that are upstairs that allow you to look down on the courts. I think you would get an even greater advantage from your interest in the use of glass if more of the everyday use of the space happened on the main level. Maybe you could keep the pool on the lower level and keep more of thy gym on the main level? Although that reminds me of another practical concern. I think you aware that it is hard to control temperature and the smell of chlorine from the pool, so it needs to be in its own contained space. Anyway, overall, I think this is a very strong project, good process, and a very nice building.