How the world's fastest man learned to walk again

US athlete and Olympic champion Michael Johnson is one of the greatest sprinters in history. In the 1990s, he tore through the record books with a series of thrilling gold medal wins. Even after he retired from racing, he kept up a rigorous work-out regime, exuding health and fitness. So, for Michael it was frightening and unnerving when he had a stroke in 2018. It left him unable to move by himself and he had no idea if he’d ever recover. Michael Johnson was once the fastest man in the world - would he learn to walk again? Presenter: Neal Razzell Producer: Maryam Maruf Sound design by Joel Cox Picture: Michael Johnson after winning gold and breaking the 200m world record at the 1996 Olympics Credit: Getty Images