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Many sources recommend running in different shoes every other day. If you can't purchase two pairs of shoes at one time, expert runners suggest buying a new pair of shoes halfway through the life of your current pair. Alternating your running shoes gives the cushioning foam a more time to “recover” between uses, and theoretically increases the life expectancy of the shoes.
One thing to remember is not to alternate between a new pair of running shoes and an old pair. Shoes wear down easily, and you want to maintain the cushion and support in your shoes for proper injury prevention.