It's one of Britain's most successful sports - but it's been a summer of reckoning for gymnastics.

Claims from top gymnasts, alleging bullying and emotional abuse by some of their coaches, have emerged on an almost weekly basis.

Now, Sky News has learnt that some gymnasts are collectively launching legal action. But how has this happened?

In this special report, Sky's sports correspondent Martha Kelner looks back at a 30 year period in which British gymnastics has achieved success on the world stage by emulating eastern European coaching methods - but at a heavy cost.

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