By Jonathan Spencer For Mailonline
Published: 12:01 GMT, 15 January 2020 | Updated: 12:18 GMT, 15 January 2020
Eliud Kipchoge remains defiant that the controversial Nike shoes that he ran his sub-two-hour marathon in are 'fair', claiming the sport should get on board with technological advances.
Nike's range of Vaporfly shoes are under intense review from a panel of experts at World Athletics after they sparked the biggest mass drop in road race running times in history.
Kenya's Brigid Kosgei smashed Paula Redcliffe's marathon record in Chicago, recording a time of 2hr 14min 4sec while wearing the Nike Vaporfly - which are set to be banned.
Eliud Kipchoge celebrates as he crosses the finish line in under two hours in Vienna