Even my six-year old has become very strong. "He feels that fighting in an orderly way according to specific rules is an outlet for young people's energies, but he hates street fighting.
小孩子多，難免互相吵架、打架，「我就叫他們到道館裡打，打贏的，還給獎品！」就是最小的六歲男孩，也練得極其結壯。