Author: John Arnold, Senior lecturer, Sport & Exercise Biomechanics, University of South Australia

Any runner will tell you there’s nothing better than slipping on a brand new pair of shoes. But how regularly should runners fork out hundreds of dollars on their next pair? Conventional wisdom tells us the average lifespan of a running shoe is around 500 to 800 kilometres. But where did this advice come from, and is it based on science? Some evidence comes from impact testing with machines designed to simulate the shoe repeatedly contacting the ground during running. Other evidence comes from monitoring runners who have used shoes in the real world for long periods. This research is…