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You feel a sudden twinge in the back of your upper leg, followed by tightness.
Here's why: The muscles that run down the back of your leg are delicate. Hamstring pulls happen when you add a burst of speed or quickly change direction, especially if the muscles aren't warmed up.
Feel better: For severe pain, see your doc. Mild to medium? "Sit on the floor with your injured leg bent and your other leg straight for support," says Mitchell. "Using the fingers of both hands, reach behind your leg and apply pressure while stroking upward from your knee toward your glutes for several minutes."
Your new game plan: Strengthen your hamstrings by adding one minute of jogging backward to the end of your regular run.