While exercise usually supports health, extreme exercise can be detrimental to the immune system in some instances. Studies suggest that people performing moderate endurance exercise experience fewer respiratory illnesses, while athletes performing intense endurance exercise of longer than two hours have an increased risk of illness. Whether extreme endurance exercise suppresses immune function transiently due to stress hormones such as cortisol or via another mechanism is a subject of much debate. In this clip, Dr. Rhonda Patrick describes how varying levels of exercise affect the immune response in different ways.
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