Video: How to Restart Your Fitness Routine

Ironman finisher Stacy Ahearn on getting back in shape after a rare disease diagnosis.

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Before being diagnosed with a primary immunodeficiency condition, Stacy Ahearn made her mark as an endurance athlete by completing several marathons and even finishing the Ironman race, a 140.6-mile event that includes a 2.4-mile swim, a 112-mile bike ride and a 26.2-mile marathon. Since her diagnosis, Stacy has found new ways to pursue her passion for fitness. See her Promising Tips for patients on restarting a workout routine while managing a rare disease.