I'm not in the league of you roadrunners, but would you have advice for a sneaker for my son, who is in varsity cross country and track? I bought him some expensive running shoes from Nike, but he said the heels were too high for him, so he keeps going back to the cheapest, flattest sneakers from Payless or Costco. He ran one pair so hard that a hole wore in the sole. Will he injure himself this way? Should I replace the shoes as soon as the tread is worn? He's doing well and is the fastest runner in his grade.
Thank you.