Swimming Lessons - I'm Not a Strong Swimmer

kam, so he's doing some swimming lessons, and i went on monday to watch him in his swimming class. It was great to see him so stimulated and ited because he really likes the water. So this activity has been on my mind a lot lately. But me personally, i'm not a big swimmer. My dad can tread water for a really long time. He can move his arms and legs and stay afloat for, i don't know how long, but a long time. I can't do that. And i can't tread water really well either. In english, the phrase tread water refers to when you can move your arms and legs to float in water