Vitamin D plays a crucial role in exercise performance. It contributes to muscle function and strength by facilitating calcium absorption necessary for muscle contraction. Adequate levels of vitamin D can enhance athletic performance, support immune function, and aid in recovery post-exercise. Additionally, it has been linked to improved mood, which can positively affect motivation and adherence to exercise regimes. Low vitamin D levels may lead to fatigue and decreased muscle strength, negatively impacting an individual’s overall fitness potential and daily activity levels.