I like the blurred softness from movement but would have preferred that you use a portrait format to see more of the young boys body to see that you are pushing him up with your feet. Lighting and toning is good. Nice compelling image.
love the expression. this might look better as a complete bw. you might also want to try this shooting on an angle that offers a little more head room.
I remember always doing that when I was little, and now that I'm older I caught myself doing to someone little...life, ha. I'm sure you brought a lot of people back to their childhood.