This is one of the common complaints by most of the pregnant women. Safe exercises during pregnancy need to be done. Why doing exercise during pregnancy is important? Most importantly, exercises helps in avoiding the excessive weight gain and keep you to stay in shape. Fitness balls are often used in the abdominal exercises or through supporting objects. Sit ups and crunches are better to be done for abdomen in the first trimester of the pregnancy as with initiation of second trimester it becomes harder for the pregnant women to do them.