Running shoes are tough. But they don't last forever. Running shoes take a beating under our feet, bake on the asphalt and get caked in mud (not to mention sweat).
The outsoles begin to go bald and the cushy foam gets compressed under our weight. When shoes are on their last legs, they lose the ability to protect your feet and joints from running's repetitive pounding, which can lead to increased soreness and injury. So, it’s important to replace your kicks at regular intervals.