Recent research indicates that physical activity before and during pregnancy helps lower the risk of gestational diabetes and preeclampsia. Physical activity during pregnancy has no negative effects on the risk of preterm birth, low birth weight and birth complications; however, thus far the topic has not been widely explored. In the light of the available findings, although of limited scope, it seems justified to encourage healthy pregnant women who are already physically active at the onset of pregnancy to maintain their activities but to reduce their intensity and to encourage pregnant women who are not already physically active to initiate physical activity.