2 Technique and Shoes

Three simple form changes will add speed and end the debilitating heel strike.

We humans are movement machines. Evolution built our bodies to run, walk, and stride for long distances at fast speeds, probably to track down animals for dinner—and run from them when they have other ideas. Compared to our slower primate cousins, human bodies have a large number of running-friendly features: shorter arms to balance the cyclic movement of the legs; lighter lower legs and thicker hips, which allow the leg to swing with little effort like a pendulum; bigger, more complex feet, to absorb shock; and thicker lumbar vertebrae, also to ...

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