We trained for a while in a racketball court. One year it developed frequent leaks. It wasn't the wet spots that we had trouble with though it was the scaffolding the maintanace crew left in their one day they had been doing repairs. It was in the front left corner of the room. And as senior student at the time I was the one who had to keep dodging it. Trying to keep one eye on that scaffold did wonders for my concentration that night - not.