A little before London 2012, we went to China to make a film about the price of the country’s relentless pursuit for sporting excellence. Some of what we witnessed was truly depressing. Injured former athletes, forgotten by the state. A retired gymnast begging on the streets. A one-time basketball pro living off the charity of others. But we also learnt that things were changing, and that life for a new generation of athletes might prove to be a little different from their predecessors’.