After all I have running friends who tell me they 're hitting over 1,000 miles in a single pair of shoes .
Is it actually true that you should n't keep on running until the soles are flapping in the wind ?
After all I have running friends who tell me they 're hitting over 1,000 miles in a single pair of shoes , or is it actually true that you should n't keep on running until the soles are flapping in the wind ?