Road Trail Run: Nike ZoomX Streakfly Review: buttery smooth from heel to toe — a monolith of pleasant and inspiring support but is it a 5K Race Flat?
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![Measuring heel-toe drop (Reproduced with kind permission of Journal of... | Download Scientific Diagram Measuring heel-toe drop (Reproduced with kind permission of Journal of... | Download Scientific Diagram](https://www.researchgate.net/publication/331824433/figure/fig2/AS:737535722536960@1552853627070/Measuring-heel-toe-drop-Reproduced-with-kind-permission-of-Journal-of-Foot-and-Ankle.png)