Recently, I learned that Golden Haired Lion King Tse Tsun's martial arts improved greatly during his twenty years living on Ice Fire Island. Part of this, apparently, was the result of the temperature extremes of the island itself. Cheung Chui San and Yan So So spent ten years on Ice Fire Island, but when they returned to China, Cheung Chui San's martial arts were said to have fallen behind those of his Mo Dong Sect martial brothers (due to having been away from wulin for ten years and out of practice). Why did Tse Tsun improve but not Cheung Chui San?