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In 2002, The American College of Obstetricians and Gynecologists, also known as ACOG revised their stance on exercise during pregnancy. While past guidelines for prenatal exercise have always been conservative, the newer guidelines present far fewer restrictions. Perhaps the most radical changes in position involve their recommendations regarding heart rate during prenatal aerobic exercise. It was once believed that heart rate should not exceed 140. However, given that a pregnant women's maximal heart rate is often higher than the usual 220-minus age, many women were hitting that 140 beats per minute mark without any significant exertion. The modified guidelines suggest that pregnant women follow the perceived exertion scale. Here are some of the other ACOG guidelines for prenatal exercise.