A Taiwanese singer has sparked controversy for performing a “vacuum belly” workout routine at a concert in northwestern China.Videos of Ella Chen Jiahua showing her contracted belly, with her ribs prominently protruding, at her concert in Xian, Shaanxi province on March 7 have gone viral on social media, China Youth Daily reported.Chen, 44, tells her audiences: “I would like to perform a stunt for you. Please look at me carefully. Cameramen, please zoom in on me.”She begins the movement while...