![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=1200&quality=85&auto=format&fit=crop&s=55e85394b57520d2363ab947d6a2b21e)
IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian
![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 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](https://i.redd.it/rzzu5u8air1a1.jpg)
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
![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=700&quality=85&auto=format&fit=max&s=f452b66b1e38d58b37ab6170aabd2027)
IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian
![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)