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    Muscle cramps (sometimes called charley horses) are caused by muscle spasms (contractions). Common sites of muscle cramps include the calf, abdomen, hand, ribs, and thighs. Possible causes include poor circulation, dehydration, fatigue, hot outdoor temperatures, calcium deficiency, and more. Follow the links below to find WebMD's comprehensive coverage about how muscle cramps are caused as well as treatments and prevention tips and much more.

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    Heart Rate Calculator

    Ensure you're exercising hard enough to get a good workout, but not strain your heart.

    While you are exercising, you should count between...

    -
    Beats
    PER
    Seconds