Changing shoes (or going without) For Any runner, HOWEVER, Whether you're a novice jogger or Experienced marathoner, Should not be taken lightly. Very small alterations in how your foot falls as you run affect your body and your running economy Significantly. Any time you Increase mileage, begin a new training regimen, or experience bread while you walk or run, year-have expert Evaluate your gait and your foot shape to determined the best running shoe for your feet.