I both want this to be me, and find it terrifying.
My friend had an old golden retriever that would follow us everywhere, even though he had arthritic hips. They made it difficult for him to do much besides sit in the middle of our basketball games and bark in everyone's face. He also would jump into the lake when we went swimming, even though he couldn't climb out without help, then swim from person to person to scratch them with enthusiasm. He was playing, of course, but it sure was dangerous!
These dogs all look young and healthy and in control of themselves, but if a giant (friendly) horde of golden retrievers were chasing me through a body of water I would lose my sh*t. I'm not the accomplished swimmer that this little boy is though. So, I guess I envy him his dog entourage and his athleticism.