Clean air contributes to fitness outcomes by enhancing overall respiratory health and athletic performance. Exercising in polluted environments can hinder oxygen intake and can lead to respiratory issues and other health problems. Clean air supports efficient oxygen delivery to muscles, which is crucial for endurance and performance. Additionally, fresh air encourages outdoor activities, which have additional benefits, such as improving mood and reducing stress. Therefore, prioritizing clean air environments for workouts can significantly enhance the effectiveness of fitness programs.