Pop singer Liu Genghong from China's Taiwan region has gone viral with his home workout videos. Liu started teaching aerobics on livestreaming app Douyin, the Chinese-version TikTok, in 2021. But his popularity skyrocketed in the last two months as millions of Shanghainese were restricted to their homes. A 90-minute workout with Liu and his wife Vivi Wang can attract up to 4 million viewers.