We are in the south... 100+ degrees most days! Morning practices are better since the gym is a little cooler, but ours is a big metal building as well. I remember going to my first meet where it was FREEZING inside and for some reason (probably since it was what I liked), I loved it. My advice is to give those gymnasts the advice to hydrate hydrate hydrate! Fans won't do much for us, but if it gets to the point where someone feels weak from heat+exercise, I'd say thats too hot. Believe me, I know what it's like to do an hour of Plyo combined with the heat of July. Georgians know us some heat