How Strong is Your Stride?

A power-generating insole means a phone charge is never more than a few steps away.

As powerful as you feel propelling your body through space on a run, imagine if all that energy could be quantified and actually used? Meet SolePower, the shoe insert that converts kinetic energy into usable electricity. The waterproof insole can fully charge an iPhone once powered up by 2.5 to 5 miles of activity, depending on how briskly you walk or run. The company plans to release the insoles next summer, with aims that they'll eventually be utilized by the military, during disaster relief, and to provide a reliable power source for those in developing countries. 

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