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Track shoes made for training, or as we like to call them, sneakers, have cushion that gets pounded down and loses it strength and stability. You need your training track shoes to hold their structure in order to support your feet and thus your legs and back because you spend all most all of your running time in these types of track shoes.
If you train on overused shoes, you are repeatedly hammering the sections of your feet, legs, and back that need the most support. You know this because the way you run wears the shoes down in these places faster than others.