![IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian](https://i.guim.co.uk/img/media/278bf5db6b5a9f9ccb47f686bc3a94c9e7c9495b/326_192_1100_660/master/1100.jpg?width=1200&height=1200&quality=85&auto=format&fit=crop&s=55e85394b57520d2363ab947d6a2b21e)
IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian
![Eliud Kipchoge will wear Nike's controversial shoe for first time in an official race at the London Marathon | CTV News Eliud Kipchoge will wear Nike's controversial shoe for first time in an official race at the London Marathon | CTV News](https://www.ctvnews.ca/polopoly_fs/1.4792027.1580486943!/httpImage/image.jpg_gen/derivatives/landscape_620/image.jpg)
Eliud Kipchoge will wear Nike's controversial shoe for first time in an official race at the London Marathon | CTV News
![Former marathon world record holder says hi-tech shoes are 'like doping' and calls for ban | The Independent Former marathon world record holder says hi-tech shoes are 'like doping' and calls for ban | The Independent](https://static.independent.co.uk/2021/04/30/13/GettyImages-1278394511.jpg?quality=75&width=640&auto=webp)
Former marathon world record holder says hi-tech shoes are 'like doping' and calls for ban | The Independent
![Technological doping: The science of why Nike Alphaflys were banned from the Tokyo Olympics | BBC Science Focus Magazine Technological doping: The science of why Nike Alphaflys were banned from the Tokyo Olympics | BBC Science Focus Magazine](https://images.immediate.co.uk/production/volatile/sites/4/2021/08/Alamy_2F3Y8J0-crop-ff47efc.jpg?resize=960,413)