Running long distances can improve your endurance, which can improve your speed. Increasing your mileage allows you to get more comfortable when you run. When you improve your stamina, you get to improve your strength and your pace. Before you work on your speed, it’s crucial to work on your endurance first. You will be comfortable with running when you add distance to your training. When this happens, then you can improve working on your stride. It is critical to work first on your endurance to avoid injuries. As running is a high-impact sport, it puts stress on your joints, muscles, bones, as well as your heart and lungs. Your aerobic capacity depends on your stamina. Improving your endurance will also improve your ability to run long distances. In conclusion, there is a correlation between stamina and speed. When you improve your strength, you can also increase your running speed. It can happen when you add distance to your training.