Staying active is great for you and the baby. If you have an uncomplicated pregnancy you can continue your current exercise regimen with a few modifications. When doing cardiovascular exercise (walking, running, biking, elliptical trainer) a good guideline is to keep your heart rate at a maximum of about 140 beats per minute. This will allow blood flow to go to the uterus as well as your large muscles. If you are working out with weights, modify exercises that require you to be flat on your back or flat on your stomach after 12 weeks. Cut out abdominal exercises, they won’t be effective.
If you are not a regular exerciser, walk for 20-30 minutes 3-5 times a week, and consider a prenatal yoga or pilates class (we can recommend one).
Occasionally complications such as bleeding, preterm labor or high blood pressure will prevent you from being able to exercise, but for most women regular exercise is a great way to prevent excessive weight gain, reduce stress, and keep the physical strength necessary to deliver and take care of a new baby.