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IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian
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Nike Vaporfly Shoes Helped Eliud Kipchoge Run a Marathon in Under 2 Hours. Should They Be Banned? | Inc.com
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Too much spring in their step? Nike running shoe under scrutiny after record marathon times – GeekWire
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Controversial Nike Vaporflys to escape ban but running shoe rules will tighten | Athletics | The Guardian
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Eliud Kipchoge denies platform Nike shoes violate the spirit of sport | London Marathon | The Guardian
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