![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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World Athletics denies tipping off Nike over new running-shoe regulations | Athletics | The Guardian
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Controversial Nike Vaporflys to escape ban but running shoe rules will tighten | Athletics | The Guardian
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