Seasonal changes significantly affect physical activity levels due to variations in weather and daylight. In warmer months, people tend to engage more in outdoor activities like running, cycling, and swimming, leading to increased exercise. Conversely, colder months often see a decline in activity levels, as harsh weather discourages outdoor exercise. Additionally, changes in sunlight exposure can impact mood, influencing activity levels as well. Adapting fitness routines to seasonality—such as utilizing indoor workout facilities in winter—can help maintain consistent activity levels year-round.