Like a lot of Seventy year olds, my mind is much more likely to jump back in time, than forward. Today I thought back to how huge swimming pools were when I was a kid. The smell of drying off on cement or a towel. The heat coming up from the cement warming your body back up. Girls in their bathing caps, almost always with a little flower on the side.
No bikinis tho. Not until I was a Teenager. Most girls and women wore a one piece suit. Some of the more daring ones, wore a two piece...but those were very modest compared to a bikini.
The pool in the picture is where I learned to swim. It was gigantic. Located near the Zoo, I could walk there from my house. Hundreds of kids swam there. The Lifeguards would let you inside the deep part where the "Octagon Platform" was located. The water there was over ten feet deep!

So you had to swim four times around the fence that separated the deep end from the rest of the pool. If you did it, they gave you a special wrist band, and that would allow you to go through the gate into the deep end.
Then you would climb up onto the Octagon and dive, jump, or get thrown off by other kids.
I was so tiny (smallest kid in my Class for my entire School years, except my Senior year in HS...where I climbed up to the small end of average height) that the older kids and teens, would swing me like a sack of potatoes and throw me in the air. I really believe that is why I became a pretty good one meter board diver.
Those kids would throw me so far in the air, I had time to do "tricks". And it was all in good fun. If someone pushed me off, or threw me with any mean spirited intent, well, a dozen tough teens would come to my defense.
Often my Mom would let four or five of us walk down to "Brooky" pool for the whole day. She would pack us all some PBJ sandwiches, and give us a nickel (A NICKEL!) to buy a drink for ourselves.
I stayed in the water until my lips turned blue, then it was laying on hot cement until warm again. Repeat. My older brother's well, they hung around girls...yech. And my Sister's attracted a lot of attention themselves. I had no idea how cute or pretty my Sisters were. They were just annoying and bossy to me.
Later I became a LifeGuard...and I understood why so many teens came to the pool. LOL
We would be there when it opened at 10:00 AM, and leave when it closed at 6:00 PM. Did I forget the sunburns? There was no "sun block" when I was a kid. Only copper tone sun tanning oil. And that smell sticks too. We all had the Irish Genes, so we wore T-shirts and lathered up with what little protection Coppertone provided. Every one of us got at least one sunburn that kept us out of the pool for a week. My sister got burnt so bad she had blisters the size of quarters on her shoulder and back. She had to stay home for a while. We all did the best we could to comfort her...and then peel off the skin when the blisters broke. We all learned where the shady parts to hide from the blaring sun were.

Those were some long glorious summer days. No wonder there weren't any fat kids when I was young. A two mile walk to the pool, swim for eight hours, and walk home. Girls or boys, it didn't matter. We played. Never even realizing we were exercising. We just had fun.