LOL. Jack used to kick me a lot, and he still does! He does these big huge kicks too - usually right into my c section scar.
And I too worried about dropping his squirmy butt. I actually had to learn to have a firmer hold with him b/c there were a couple of times he almost did a peter pan right to the floor!

Babies can be so sneaky - one minute he would be sitting passively in my arms, and then the next he is trying to careen head first into the ground.
I think it is a great that your little girl is so active in your belly

Maybe she will get into gymnastics!