These grannies, as Taylor Swift once said, “can’t stop, won’t stop groovin’.” For the past several years, millions of senior women in China have taken a liking to line dancing in public squares at dusk or at dawn. The grannies use this time not just to exercise, but also to meet other seniors and gossip about their lives. The wildly popular practice even broke a world record in 2014, when more than 25,000 line dancers gathered in Hangzhou, China. On Tuesday, China’s General Administration of Sport and the Ministry of Culture, introduced a policy that would regulate all line dancing in China to 12 approved dance routines at allowable times and music volumes.