I replied to your other thread but Jackson loves to swim and has since he was young!  He spends the whole summer swimming off and on. It's such a great form of exercise. 
 
We use the life jacket on boats etc but I don't bother anymore with it while he's just in the pool.  He's a strong swimmer and I'm always with him.  
https://www.youtube.com/watch?v=YMV2...nJy0e5dC5PD9qA