If you are running seriously (i.e. 5+ times/week), you want to have 2 pairs of shoes that you rotate to make sure they have enough time to "recover". Your shoes should last you 450-550km outdoors - make sure you don't stretch that too much - your knees will thank you. You can keep using "worn out" shoes on the treadmill as it has plenty of cushion (as compared to asphalt).
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