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Double Olympic champion Michael Johnson has shared the incredible progress he has made since suffering a stroke 12 months ago.

Johnson, 51, posted footage of him struggling to walk in his first physical therapy session alongside a recent clip of him doing an agility ladders drill.

The athletics legend, who previously held the record for fastest man in the world at 200m and 400m, wrote on Twitter: 'A year ago today I was unable to walk having suffered a stroke.