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Exercise  Kinds of Physical Exercise  A successful exercise
program involves frequent physical activity that is rhythmic,
repetitive, challenges the circulatory system, and uses large
muscles. The exercise program must significantly increase the
blood flow to the muscles for an extended period of time,
promoting cardiovascular fitness. Such exercises are called
isotonic, dynamic, or aerobic. If you want to have a healthy
heart, you need to perform aerobic exercise.  Aerobic activities
really "get the blood pumping." As the heart beats faster, the
blood circulates more quickly, delivering extra oxygen to the
muscles. This builds strength, or cardiovascular fitness. Some
recommended aerobic activities are walking, hiking, jogging,
bicycling, swimming, jumping rope, and roller skating. Some
forms of exercise, like weightlifting, can build muscle strength
without building cardiovascular fitness.  What's This?   Change
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