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The Relationship Between Propulsion and Metabolic Cost
There seems to be this kind of optimal window rather than an optimal value. People can actually alter their stride length and reduce it by 3% so that would increase their stride frequency. And you wouldn't affect your metabolic cost hugely. So, there's a window where we can actually make these kind of adjustments and not see huge effects upon our economy. The closer we get to having certain mechanics that when we ask runners to maybe then manipulate we actually see that economy will shoot up.