If you run or walk on a regular basis your footwear is the most important part of your equipment. If you keep using your running shoes past their expiry date you will risk injuring yourself.
The following signs outlined below will indicate you need to replace your running shoes.
Inspect your shoes on a flat surface to evaluate if the heel counter is perpendicular with the surface. If the shoes are distorted inward or outward, this is a sign of material fatiguein the heel counter as well as an indication of your mechanics.