By Jack Kinnersley For Mailonline
Published: 20:32 BST, 24 April 2019 | Updated: 20:32 BST, 24 April 2019
Sir Mo Farah faced one of his toughest challenges yet when he came up against a giant treadmill.
The most successful British track athlete in modern Olympic history was taking on the Abbott World Majors Challenge in which you have to run 400m at the same speed as the world record marathon holder.
Farah found it difficult as