a well balanced child

"Mom, did you see that boy did a standing back-tuck?"

"I did.  He must be some sort of athlet.  At first I thought he was a football player but I don't know now."

"Yeah, I think he is a football player too." <pause to look back at the ~17 yr old boy throwing a football around with his friends> "Mom, does football have a standing back tuck in it?"