Anonymous wrote:OP here. I agree swimming is a life skill. I was swimming for years already by that age. He has taken multiple swimming lessons and is taking them again now but JUST.CAN'T.SWIM. He sinks like a rock. His body is extraordinarily dense or something and he is not particularly athletic or coordinated. He's also afraid to relax enough to float. I'm really concerned for his safety.
This might be a controversial suggestion, but I'll throw it out there:
My brother was the same age -- 11 -- and still unable to swim. He was both super skinny (=low body fat, = less buoyancy) and unable to relax. Lots and lots of lessons at the neighborhood pool failed to accomplish anything.
Finally, my mom hired a kind and (this is relevant) cute 16-year-old girl who lived nearby and was a strong swimmer. My dad talked with a colleague who had a small backyard pool and arranged for them to use it briefly several times a week during the day while he & his wife were at work. My mom would sit by the pool and read while the 16-year-old taught my brother to swim.
The combination of patient one-on-one attention from the teacher and his own interest in impressing an older, attractive girl did the trick; my brother learned to swim.