Off Track ..... Growing pains for tiny teenage champion

Diving champion Chen Ruolin fears the tiny teenage body she has tuned to medal-winning perfection may be about to betray her.

Nerves of steel and an almost flawless last dive put her on top of the podium for the 10m platform, an event that has eluded the host nation, diving's dominant powerhouse, for two Olympics.

That challenge over, the new opponent for one of the Games' youngest medalists is puberty.