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There are many hamstring stretches, and it doesn't matter which one or ones you do, but in my experience it is helpful to incorporate some hamstring stretching into your pre-run routine. The evidence is unclear as to whether stretching really will prevent hamstring pulls, but you can't go wrong with a stretch or two. Try this one: Lie on the floor on your back, with legs straight. As you slowly raise one leg, grasp it with both hands just below the knee. Keeping leg straight, raise it to 90° - or as close as you can comfortably come. Hold for 30 seconds. Release, and repeat on the opposite side. Do two or three on each side.