Trust a Kenyan, hailing from the land of unbeatable marathon runners, to come up with a way to charge your phone using energy created by walking in your running shoes.

Anthony Mutua showed off his invention at the Kenyan Science Technology and Innovation Week. It works using pressure, sending energy to an inserted “crystal-chip”.

As you walk you generate pressure that in turn generates energy, once you have arrived where you were going you can now sit down and charge your mobile phone or charge while you walk.