Seasonal allergies can negatively affect outdoor physical activity by causing symptoms such as sneezing, itchy eyes, and fatigue. Individuals with allergies may experience discomfort that deter them from engaging in exercise, especially during peak pollen seasons. The severity of allergy symptoms can lead to decreased motivation, reducing physical activity levels. To mitigate these effects, people can monitor pollen counts, exercise indoors during high allergy seasons, or consult with healthcare providers for appropriate management strategies to stay active.