Immunity plays a crucial role in fitness performance as it protects the body from infections and diseases that can hinder physical activity. A strong immune system enables individuals to train consistently without interruptions caused by illness. When physically fit, the body is better equipped to handle stressors, both physically and mentally, promoting faster recovery from workouts. Adequate nutrition, including vitamins and minerals, is essential for immunity, as deficiencies can lead to decreased performance and increased susceptibility to injury. Thus, a well-balanced regimen supports both fitness and immune health.