Craig Hockenberry writes about his experience using his Apple Watch while swimming.
I suspect that the watch’s water resistance has been undersold by Apple just like battery life: it’s better to under-promise and over-deliver. Still, it’s a personal decision on whether you want to ignore Apple’s recommendation. You’re not likely to get much sympathy at any subsequent trips to the Genius Bar.
It works for him, though, and his arms are like five feet long.