![Julien Guiblain on Twitter: Julien Guiblain on Twitter:](https://pbs.twimg.com/media/B_LwIHyWwAACjVw.png)
Julien Guiblain on Twitter: "Businesses must deliver a high customer service. Nike accomplish this through social media using twitter #mg337 http://t.co/aDAk3bDzKX" / Twitter
![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=900&quality=85&auto=format&fit=crop&s=41bcaaf0ab1aa79734de7bacb28d84a3)
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 IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian](https://i.guim.co.uk/img/media/5b565649b2e231edfd00ebbe32d49e4648b49553/338_640_2787_4832/master/2787.jpg?width=445&quality=85&dpr=1&s=none)
IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian
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