Calcium is an essential mineral for muscle contraction and relaxation. It plays a critical role in the excitation-contraction coupling process in muscle fibers, allowing muscles to contract effectively in response to nerve impulses. Proper calcium levels are vital for optimal performance and recovery in physical activities. An imbalance can lead to muscle cramps, spasms, or weakness, hindering overall performance. Thus, maintaining adequate calcium intake is crucial for those engaged in regular exercise and physical activity.