The hamstring - a group of muscles that support the hip joint and attach to the lower leg - gets injured from overuse, especially if you're over striding during a run. Reinjury rates are 80 percent because scarring of injured areas creates more tension, so stretching after a warm-up is especially important. Stretch by putting your foot on a chair and leaning forward while bending at the hip until you feel tension in the hamstring. Hold for a minute and switch legs.
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