Michael Johnson sums up British success

It's been a golden week for British athletes at the World Athletics Championships in Beijing in China.

With gold medals for Jess Ennis-Hill, Mo Farah and Greg Rutherford.

Shara Proctor broke the British record in the long jump to win silver.

Dina Asher-Smith, 19, also broke the British record in the 200 metres.

Martin's been chatting to former Olympic Champion Michael Johnson about his highlights.

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