what's he siked about next? are you keeping him off harder lines?
btw, is it unusual for a 6 yr old girl to be doing pullups?
I was at the park yesterday with Seija, and this little girl started doing laps on the monkey bars non-stop. i asked her if she could do pull-ups. "what's that?", she said. I showed her, and she whipped out 3, perfect form. it was sick, i say.