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Spring 2023 Marathon Training Rotation: Nike Pegasus Trail 4, Nike Tempo, Nike Pegasus 39, Nike Alphafly 2, & Nike Invincible 2. Details in the comments. : r/RunningShoeGeeks
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IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian
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Too much spring in their step? Nike running shoe under scrutiny after record marathon times – GeekWire
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