The best part about the summer to me is going swimming in the fresh water pool and having fun.
I love to go swimming, my brother is insanely fast in a pool, I am not very fast, but still like to go from time to time!
My husband i s to he was a lifeguard in his teenage years so he can hold his breath for a long time and swim fast.
I can hold my breath for like a maximum of 25 seconds before I am ready to pass out, I am built to swim fast but never practiced much
I can hold my breath long but not swim super fast swimming fast relies on your body buoyancy. 
I think I float okay, I just never developed the muscles for it 
The body can float very easy long as you have a density of 0.98 which we do in water.
That is interesting, I never knew the number, but I am surprised we really float at all!
Yes it is based off of our body fat but the thing is you have to be active as well and not panic especially in higher levels of water.