Workout Gear: Running Shoes
Life span: About 8 months—or about 400 miles—for an average runner (10 miles a week)
Every runner is different, but a good pair of running shoes provides sufficient support for about 300 to 400 miles, says Johanna Bjorken, merchandise director of JackRabbit Sports stores in New York City. Just because the treads on the bottom of your running shoes don't look worn down, it doesn't mean they're still in good condition: The real wear happens in the midsole of the shoe, which is the spongy material that's usually made of air-injected foam inside the shoe under your foot.
When to replace: Pain—such as shin splints, knee soreness, or ankle aches—is usually the first sign that you need to replace your running shoes. But you can also find clues by examining the midsole, says Bjorken. When it starts to look wrinkled or like a dried-up sponge, your shoes have hit their limit.
How to make it last: Heat can break down sneaker's materials, so never put your shoes in the hot trunk of your car or through the dryer.