The real problem is the
sport pools that are too hot to work out in in any given summer. That and the messengers have already been shot, trashed, sliced, and diced on other threads, but I'll say this one thing.
How many people would go bowling without air conditioning here in the summer? After all, bowling has the most participants of any sport here in TV. How many people would use the TV fitness centers at regional rec centers without air conditioning? Air conditioning is very expensive, too. The sport pool schedules are full of classes and teams all day and into the evening, which to me indicates there are many participants in the aquatic fitness venues--sport pools.
Just because you don't do a particular sport doesn't mean you should trash reasonable suggestions from reasonable people, who for example, suggest commercial pool chillers:
commercial pool cooler
Commercial Swimming Pool Cooler Chiller / Glacier cooling for your pool! No more bath water in hot summer months.
So let the trashing begin..............
.