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Even new running shoes that fit will can be stiff at first. When you get a new pair, even if they are identical to your last pair, take the shoes for a walk the day before you wear them. Try to walk for half an hour or so. Alternatively, wear them around the house for a day.
Of course, many runners are able to run in a new pair of shoes right out of the box, which is probably fine for a few miles. But if you want to do a long run in new shoes, try the walking break-in first. Why not save yourself a sore spot or blister if you can?