Muscles can’t save Kim Jong Kook from the slippery mat while SAN breezes through the challenge! #fyp #runningman #yujaeseok #yoojaeseok #kimjongkook #haha #yangsechan #songjihyo #jiseokjin #jisukjin #jiyeeun #hanjieun #san #kvariety #kvarietyshow #koreanvarietyshow #koreanvariety #kocowa