When they had just started coming to the dance group they all put on a reserved, solemn, "old-personly" appearance. To ask them to shake their arms and legs in front of strangers, let alone to twist their waists and wiggle their bottoms, not only required them to overcome physical limitations, but even more to break down some psychological barriers.
一下子要他們在陌生人面前手舞足蹈，甚至「扭腰擺臀」，不但有身體上的限制，更需要突破一些心防。