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New iPhone App Helps Runners Detect Energy Efficiency With 2-Minute Test

Nov 19, 2012 - If one looks at elite runners, their heads look like they are sliding on a rail: this means they are using most of their muscle energy in the forward direction, rather than bouncing up and down. Kangarun 1.1 is potentially the first app on the App Store to measure running efficiency by calculating the actual physical energy wasted by excessively bouncing up and down during exercise. This could be useful for injury prevention, particularly in the case of barefoot runners.