Potassium plays a crucial role in muscle contractions by regulating fluid balance and generating electrical impulses within muscle cells. It helps transmit nerve signals that lead to muscle contractions and relaxation, making it essential for proper muscle function. Adequate potassium levels are vital for preventing cramps and maintaining muscle stability during exercise. A balanced intake of potassium-rich foods, such as bananas and spinach, is necessary to support optimal muscle performance and overall health.