The Nike Alphafly 4 is the lightest and most responsive Alphafly yet, with 10 per cent more energy return and 5 per cent reduction in weight. The shoe remains aimed squarely at marathon racing, from elite athletes chasing podiums to everyday runners trying to lower their personal bests. The bigger change is philosophical: Nike is trying to make the Alphafly’s speed easier to access and, crucially, easier to hold onto. The fourth ...

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