Online lessons, offline steps

The dance floor of Chinese square dancing fans has just got bigger - so big all outdoors are potential dance venues, as smartphone apps turn middle-aged women and retirees into dancers with a fair chance of hitting the jackpot of instant cyber fame.

Professional online dance courses, opportunities to reach vast audiences through video uploads, and chances to network with fellow dancers - it's a virtual world trodden, step after step, by real people.

Three women who have learnt some nice moves from the Tangdou Square Dance app, share their stories, encapsulating how new businesses like dance apps of startups are influencing and transforming some lives in China.