Check the height of your arches when you shop for new running or walking shoes. If you have high arches, you usually need shoes with good shock absorption. If you have low arches, you will probably benefit from shoes with good motion control (Gait & Posture, July 2007).
When you run, you land on the outside bottom of your foot and roll inward. This is called pronation, which helps to protect you from injury. If you landed on your foot and did not roll, the force of the impact would be transmitted up your leg to increase your chance of breaking bones and tearing muscles. However, as you roll in from the outside bottom to the inside bottom of your foot, you will see that your lower leg twists inward.
Excessive pronation twists your lower leg, which can cause stress fractures of the lower leg bones. It can cause knee pain because it forces your kneecap to rub against the bone of your upper leg. Excessive pronation can even twist your hip joint to cause pain in the hips and lower back.
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