Certified Personal Trainer (NSCA) 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of vitamin D related to exercise is its role in aiding calcium absorption for bone health. Vitamin D is essential for the regulation of calcium and phosphorus in the body, which are critical for maintaining healthy bones. Adequate levels of vitamin D help to ensure that calcium is absorbed effectively from the diet and utilized for various physiological processes, including the formation and maintenance of bone tissue. This is particularly important for individuals engaged in physical activity, as strong bones are crucial for supporting workouts, preventing injuries, and ensuring overall joint health.

While energy production, muscle mass increase, and mental focus are important aspects of physical performance, they are not directly linked to the primary function of vitamin D. Instead, the nutrient's influence on bone health underpins many of the other functions required during exercise, as a solid skeletal foundation allows for better movement efficiency and reduced injury risk during various activities.