1. Improve sports performance: Vitamin D, B group, iron and other nutrients can improve the endurance and energy level of the body, thus helping athletes to perform better in training and competition.

2. Accelerate muscle recovery: Vitamins C, E and zinc can help the body repair damaged muscle tissue faster and reduce muscle fatigue and soreness.

3. Promote bone health: Nutrients such as calcium, vitamin D and vitamin K are very important for maintaining bone health, especially when high-intensity exercise is easy to get injured.

4. improve immune system function: antioxidants such as vitamins a, c and e can enhance immune system function and help the body better resist diseases and infections.

To sum up, proper vitamin supplementation during fitness can improve physical fitness and health level and help to achieve better exercise effect.