My shoes for inspection were never worn. Sure, a DI may understand dirty shoes but don't give them the opportunity to give you a hit. In addition to my inspection pair I also went through 4 other pairs of running shoes. PT'ing with worn out shoes is one way to injury yourself. Everything differs though with each person. Set yourself up for success and make sure you have an extra pair squirreled away in your car.
Prior preflight planning prevents piss poor performance.
Prior preflight planning prevents piss poor performance.