My 3yo son!!! I took him to his first trial lesson at "The Pit" North, The mixed martial arts school made famous by chuck liddel and john hackleman. They usually won't start them till there four, but he did so well he is now officially a Pit PeeWee!!. He'll be 4 in OCT.
AT first he was a little over excited and I wasn't sure, but after about 10 minutes he got the hang of following direction. He even got to spar/grapple for the first time. He took a 4yo out twice, HAHA!. First he just charged him and drove him right out of the square. The second time they got into a little grappling session and my boy dropped him, then the other kid rolled on top and mounted him. Then my son rolled otu and they struggled to there feet and struggled with each other for a moment then my son chucked his ass out the ring! YEAH! That's my boy. All the wrestling we do, and with his sister who is 7 and already level five in gymnastics, and is very strong, certainly helped a lot.
Also, out of the 11 kids, all older an bigger mind you, he hung from a pull up bar longer than every one except for one kid.

I was so proud. I didn't know the kid he wrestled with father was right behind me. At the end he said my son did a good job, but asked me to tell him not to beat his son up all the time, LOL. I was so proud!
We need to work on his punches though. Little sloppy still. Man, between him and how good my daughter is at gymnastics, I am about as proud as a parent can be

And on top of it, my daughter is top of her class in academics, first grade, lol, and very good at math and reading. Of course school comes first. But for being such a shitty kid myself, I don't know what I did to deserve any of this. They are my life!!!! And actually, being on disability from my heart condition has given me so much time with them I actually feel blessed!