Muscle must be conditioned to be flexible on the one hand, and as resistant as steel on the other. Liu said that he had practiced this type of kung fu during his early youth in northern China, where the bracing climate is more appropriate.
但是這種輕功在台灣卻無法練成。練輕功要在中國大陸北方那種乾冷的氣候中修練，而且必須十歲以前就開始練。