By sportswriters He Leijing and Zhu Guoliang
NANJING, May 25 (Xinhua) -- Stepping in time to fast-paced pop tunes, dozens of boys and girls are seen briskly enjoying dance-like workouts in the playground of a middle school in the eastern Chinese city of Nanjing, with their faces wreathed in sweat and smiles.
"I adapted the movements from viral fitness videos on Douyin [the Chinese version of TikTok], and