Stamina refers to the ability to sustain prolonged physical or mental effort. It is essential for activities like running, swimming, or even studying for long periods. People with good stamina can perform tasks without getting tired quickly, allowing them to achieve their goals more effectively. Improving stamina often involves regular exercise, proper nutrition, and adequate rest. Activities such as cardiovascular exercises and strength training can enhance physical stamina, while techniques like mindfulness and time management can boost mental stamina. Overall, stamina plays a crucial role in both athletic performance and daily life activities.