People who exercise regularly should pay attention to calcium intake because exercise increases the load on bones, consuming more calcium. If calcium is not supplemented in time, it may lead to decreased bone density and increase the risk of osteoporosis. Calcium can be supplemented through diet, such as consuming more milk, dairy products, tofu, and leafy green vegetables rich in calcium. Additionally, proper sunlight exposure helps the body synthesize vitamin D, which is crucial for calcium absorption.