There's nothing like a muscle cramp — also known as a charley horse or a spasm — to capture your complete attention. You know the feeling ...

You're running across a tennis court and suddenly it feels like someone is jabbing a fork into your calf. Or you're swimming your laps in the pool, and your toes curl up and cramp so badly you have to quit kicking and head for dry land. Or you're asleep in bed — nighttime cramps are very common — and you're jolted awake wi ...

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