Last weekend the family was at the pool. Off hand I asked Zack if he wanted to jump off of the diving board. To my suprise he imediately said “yes” and quickly got out of the water and headed off to the diving board.
I was really scared treading water in the deep end, looking up at my 3 year old son standing on the end of the diving board. But almost without hesitation he jumped in! He did a canonball, and when we made it to the side of the pool he was chattering away about it. I am not even sure where he figured out what a canonball is, but he had great form 
I didn’t try to catch him out of the air, I let him sink all the way into the water. He loved it! I think he jumped in 3 more times before I couldn’t take it anymore