I grew up swimming in ponds, rivers, gravel pits, lakes, and swimming pools. I learned how to tread after my father told my 2 brothers to pitch me off the dock. Used to be able to hold my breath for 2'.....free diving regularly up to 25'. Got all swimming merit badges in the Scouts. Was a lifeguard at the local State Park pool. Eventually achieved SCUBA certification in a dank/murky lake. In college I finally took formalize classes....beginner, intermediate, and advanced. "I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched C-beams glitter in the dark near the Tannhäuser Gate. All those moments will be lost in time, like tears...in...rain. Time to die."
Now, I'm fat....can't hold my breath more than 30 seconds.....doubtful I could save anyone's life.....but I can still tread water enough to keep my beer safe.