>Health and Nutrition>"old" shoes = wretched run?
Princess Cancer Pants
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gimme some sugar, baby
Abs of Flabs
I don't think having a bad/old pair of shoe will cause all those problems so quickly. If they have lost their supportive qualities, you will feel the effects over several days in a row of wearing them. The only way to see if it's time to toss them out is to alternate your runs with and without them and see how you feel afterwards.