A 23-year-old primigravid woman comes to your office for her first prenatal visit.
She is working as an aerobics instructor and is concerned about the effect her exercise
schedule might have on the pregnancy. She teaches 30 minutes daily in the
morning and does not feel fatigued. She also enjoys scuba diving. She
does not use tobacco, alcohol or drugs. Vital signs are normal and physical
examination is unremarkable. Which of the following is the best advice to
give this patient?