![Too much spring in their step? Nike running shoe under scrutiny after record marathon times – GeekWire Too much spring in their step? Nike running shoe under scrutiny after record marathon times – GeekWire](https://cdn.geekwire.com/wp-content/uploads/2019/10/Screen-Shot-2019-10-18-at-9.16.56-AM-630x352.png)
Too much spring in their step? Nike running shoe under scrutiny after record marathon times – GeekWire
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It stretches the limits of performance': the race to make the world's fastest running shoe | Running | The Guardian
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Runners who wear Nike's fastest shoes may have a 4 to 5 per cent advantage over others in races | Daily Mail Online
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