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Rob Bonnet talks to Duncan Goodhew who, after disappointment at the 1976 Montreal Olympics, won gold in the 100 metres breaststroke final in Moscow four years later. How did he achieve that transformation and why did he decide to go to Moscow anyway, given the boycott urged by the British government at the time?

With Russian competitors at the centre of widespread doping allegations in the build-up to the Rio Games, is it right to ban the individual or the team?