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Don't wear new shoes to run a marathon. To give your feet the best advantage, put at least 100 miles on your running shoes prior to the marathon. Even if your shoes feel great the first day you put them on (which they should) and even if you're putting on a pair of shoes that's identical to your previous pair, a break-in period lets you be sure that you have the right size, and you can get used to the feel of the new shoes and reduce your risk of blisters. And, if for some reason you realize that the current pair rubs in a strange way, and just isn't going to work, you have time to buy and break in another pair before marathon day.