As a result of a number of recent studies on exercise in pregnancy, the debate over the risks of aerobic exercise in pregnancy has waned. In January 2002, the American College of Obstetricians and Gynecologists (ACOG) issued an opinion report stating that «In the absence of either medical or obstetric complications, 30 minutes or more of moderate exercise a day on most, if not all, days of the week is recommended for most pregnant women.»1 While common sense and a number of smaller observational studies and controlled trials support this recommendation, a Cochrane review,2 published in the same month as the ACOG opinion, concluded that there is insufficient evidence of benefit or harm to mother or fetus to make a recommendation regarding aerobic exercise in pregnancy. According to the review, the available studies were too small, flawed in their design, and inconsistent in their methodology and outcome measures to support a recommendation. Specific benefits of regular exercise to mother and fetus have yet to be confirmed.