Studies have increasingly shown the importance of a regular fitness routine during pregnancy. Not only is it good for your heart and muscles, but it can help relieve some of the unpleasant side effects of pregnancy, like morning sickness, aching back, fatigue, and constipation. Some studies have even shown that being in good shape can reduce your time in labor. It can also help with weight control, so that you can keep in shape without depriving your baby of nutrition.