When you are pregnant with multiples, you can multiply many things: the amount of morning sickness you may have, the girth of your waistline and your abundance of joy. But what about multiplying the amount of exercise you need? Should you double your time at the gym or relax for nine months before the whirlwind of activity arrives?

Determining whether exercise is beneficial during your pregnancy may be confusing, according to Dr. Randy Morris, a board certified reproductive endocrinologist and associate clinical professor for the division of reproductive endocrinology at the University of Illinois School of Medicine in Chicago.

What is causing all of this uncertainty? "The American College of Obstetricians and Gynecologists (ACOG) suggests that women pregnant with multiples refrain from aerobic exercise due to the high risk for potential problems," says Dr. Morris. "This information may be confusing because the recommendation for a singleton pregnancy is actually 30 minutes or more of moderate exercise a day."

Preterm labor is the potential problem that concerns physicians and their patients the most. So how do you determine if your pregnancy is too high risk for physical activity?

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