With your doctor's approval, you can feel free to continue your exercise classes throughout your pregnancy for as long as you are comfortable with it. The American College of Obstetrics and Gynecology have put forth some guidelines for exercise during pregnancy, which are posted on the Pregnancy Today Web site. Within those guidelines, you can continue as long as you don't have any unusual discomforts. Be aware that your joints are more lax during pregnancy and therefore previously comfortable moves may become precarious, so listen to your body and rest and modify when necessary.

In reality, it would be easier to teach a cardio step class in the latter part of your pregnancy than a muscle pump. As your baby grows it will be much easier to do step combinations than it will to bend over and pick up weights. How long you teach is dependent upon how you feel, and your doctor's recomendations.

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