Stamina refers to the ability of an individual to sustain prolonged physical or mental effort. It is crucial for activities such as running, swimming, or even studying for long periods. Good stamina allows a person to perform tasks without getting easily fatigued, enhancing overall performance in sports and daily activities. Improving stamina can involve various training methods, including aerobic exercises like jogging and cycling, which increase cardiovascular endurance. Additionally, proper nutrition and hydration play significant roles in building stamina, as they provide the necessary energy and nutrients for sustained activity.