I went to support a few club mates in a local 10K recently and watched the kids' fun run before the main event. What struck me as I clapped and cheered 100m from the finish was that all the children - fast, slow, fat and thin - crossed the finish

. I tinkered with my own form, switching from a heel strike to a forefoot strike and, as I did so, I started to find my usual shoes cumbersome and heavy. I began to wear lighter, more pared-down shoes. My PBs over 10K, 10 miles and the half marathon

. I tinkered with my own form, switching from a heel strike to a forefoot strike and, as I did so, I started to find my usual shoes cumbersome and heavy. I began to wear lighter, more pared-down shoes. My PBs over 10K, 10 miles and the half marathon