How to avoid illness this winter

Endurance athletes face significant training disruptions due to upper respiratory tract infections, often exacerbated by high training loads and external life stressors. A J-shaped relationship exists between exercise volume and immune function, where excessive intensity suppresses immunity and increases infection risk. Maintaining consistency requires balancing training with adequate sleep, as sleeping fewer than six hours nightly quadruples the likelihood of developing a cold. Practical preventative measures include rigorous hand hygiene, wearing masks during travel, and supplementing with Vitamin D during winter months. If symptoms arise, zinc lozenges can effectively shorten infection duration. Rather than relying on expensive blood markers, athletes should prioritize subjective self-reported measures of wellness to guide training adjustments. Recognizing the "neck-below" rule and acting early by reducing intensity prevents minor colds from escalating into prolonged health issues that compromise long-term performance goals.