Facts

• According to the American College of Obstetricians and Gynecologists, exercise during pregnancy is beneficial in two ways. First, it can help to prepare you for a smoother labor and delivery. Second, by maintaining an exercise routine during pregnancy, getting back into shape after delivery is easier.
  
  If you were active before your pregnancy, you can generally continue with the same exercise routine throughout your pregnancy. If you lift weights, the amount of weight may need to be decreased. Weight lifting restrictions differ for each pregnant woman based on her overall health as well as previous activity levels.
  
  

Safety

• According to the American Pregnancy Association, dehydration in pregnancy can lead to preterm labor. It is important to remain well hydrated throughout pregnancy and to increase your fluid intake during exercise to replace fluids lost through sweating.
  
  During exercise, monitor your breathing. Your body is working hard to supply oxygen to you as well as to the fetus. Do not exercise to the point of being out of breath or to the point of exhaustion.
  
  Avoid exercise outdoors during the hot summer months as getting overheated in pregnancy can cause birth defects. Always monitor your heart rate to ensure it is remaining within the parameters for your age and activity level.
  
  

Concerns

• In the second and third trimesters, avoid lying flat on your back. A major artery on the right side, the vena cava, supplies blood supply to your lower body as well as the placenta. This supply can be compromised when you are flat on your back later in pregnancy due to the weight of the uterus.
  
  If you have underlying health problems or issues with the pregnancy such as spotting or bleeding, your doctor may recommend that you alter your exercise routine or abandon it. Even though exercise is an important aspect, you must heed your doctor's advice if there are other conditions surrounding your pregnancy.
  
  

Misconceptions

• Many women are concerned about the possibility of an exercise-induced miscarriage, particularly in the first trimester. Contrary to popular belief, exercise during pregnancy does not lead to miscarriage. According to the American Pregnancy Association, there is no data to support this urban legend.
  
  

Dangers

• Exercise activities that could increase the risk of falling should be eliminated from your routine during pregnancy. These activities could include bike riding, rollerblading or running on uneven surfaces. The fetus is generally well cushioned and protected in the placenta, but a hard fall could lead to complications such as preterm labor or miscarriage. Contact sports should also be avoided in all trimesters.