Viral videos of Chinese dance troupe’s 90-degree back bends spark ‘blue green waist’ craze and challenges on China’s TikTok

• The all-female traditional dance troupe featured on the annual Lunar New Year show on CCTV, prompting people across the country to try and recreate the moves
• ‘Blue green waist challenges’ on Bilibili, including some comically unsuccessful efforts, have even caused doctors to warn not to try them at home