Potassium is the essential mineral for muscle contraction and is found in foods like bananas, oranges, and sweet potatoes. It plays a crucial role in maintaining normal electrolyte balance, nerve function, and overall muscle contraction. Adequate potassium levels help prevent muscle cramps and support cardiovascular health by regulating blood pressure. Including potassium-rich foods in the diet is important for athletes and anyone engaging in physical activity, as it enhances performance and overall muscle function, contributing to improved endurance and recovery.