The role of mitochondria in muscles is critical as they are known as the "powerhouses" of the cell. Mitochondria generate adenosine triphosphate (ATP), the primary energy currency used for muscle contraction and other cellular functions. An increase in mitochondrial density enhances muscle endurance and performance, especially during aerobic activities. Regular exercise, particularly aerobic training, can stimulate mitochondrial biogenesis, improving energy availability and metabolic health. Therefore, maintaining healthy mitochondria is essential for optimal muscle function and overall fitness.