Perhaps the first piece of advice that I give runners on a an almost daily basis is to replace their shoes. Sometimes I get the feeling that they think this is a cop out, like a doctor replying to something that hurts by saying, “well don’t do that then.” But here’s the thing, when someone advises you to replace your shoes, they’re not just buying time while they go get the latest copy of Runner’s World to diagnose your problem. There are often real signs and symptoms that your shoes have gone bust.Today I’d like to present to you a couple of photos to help illustrate this a little better. What I’ve done here is taken two of the same model of shoe (albeit in a different color) and photographed them together. The two shoes are a brand new pair and a pair that I’d been running on for a few months. What I’m hoping that you’ll see in these photos is how the shoe has changed in both its shape and cushioning properties. You should be able to see this just be looking at the two shoes.
This shoe is called the Nike Streak XC Racing Flat. This is a very light-weight shoe, so it shows the changes in the shape of the shoe over time perhaps better than you might see in a bulkier shoe with more structure. The first thing that you’ll notice is that the new shoe (black and blue) is essentially flat across the sole whereas the older shoe is now curved. This happens as the cushion begins to break down from the repeated twisting and curving of the foot as the toes push off the ground. You can see that the curvature involves the entire shape of the shoe, including the heel support structure behind the Achilles Tendon (the back of the older shoe is now tilted in a much more forward position).
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