Final answer:
To avoid feeling tired or needing to stop during exercise, focus on building endurance.
Step-by-step explanation:
To avoid feeling tired or needing to stop during exercise, it is important to focus on building endurance. Endurance is the ability of your muscles to continue contracting over a long time without getting tired. Aerobic exercises, such as cycling, walking, and running, can help increase muscular endurance and cardiovascular health. By regularly engaging in these activities, you can improve your stamina and perform better during exercise.