They'd frequently fall down when walking. But bodies have ways of compensating. When the arms are unable, the legs can take over. But when even those compensations no longer work, you realize that there is something wrong with your body.
楊玉欣表示，他們家 3 姐弟從小體育都是丁等，走路總是不斷跌倒，但人的身體擁有代償能力，手不行就以腳代替，但到了最後，連這樣都不行了，才驚覺自己身體的不正常。