Exercise can help pregnant women stay fit and prepare for labor and delivery. During pregnancy, the body undergoes many changes that will affect workouts. A growing belly, for example, will cause a woman's center of gravity to shift, so she may feel off balance. She should trade classes with complex choreography for ones that incorporate simpler, more repetitive movements.

Dr. Elisa Ross of the Pottstown Memorial Medical Center staff suggests these prenatal exercise tips:

Go low-impact: Swimming, cycling, and other non-weight bearing exercises are ideal. Yoga is also a great choice because it emphasizes breathing techniques, which can help ease labor.

Modify your abdominal workout: Try doing crunches on a stability ball. You can use the ball to keep your head above your hips and your back off the floor - both are important when you're pregnant.

Join a class: Exercise classes help you meet other moms and find support and camaraderie. If you can, continue going to an exercise class after your baby is born.

It is vital for a pregnant woman to pay attention to her body's needs. "Consultation with your prenatal care provider to review options should be considered," Dr. Ross concludes.