Send Dr Khan a Text Message. Ask a question or say [email protected] happens when you go from running ultramarathons to having difficulty walking? Endurance runner Courtney Baker knows the answer too well. Courtney is an endurance athlete who has been navigating long COVID for three and a half years. In our conversation, she shares her experience before and after the pandemic, her ultimate diagnosis with long COVID, and the challenges she faces in managing her sympto...