Whether you run five miles a week or train for a marathon, you face the same issue. You are asking your body to do something it would rather not. At any level of training, as you run your body is learning stamina. Your muscles are learning to store more glycogen. There will be a direct relationship between the number of miles you run and your muscles ability to go the distance.

To me, stamina and endurance are not the same. It depends on the level of your training, of course, but at some point, at some distance, you will run out of fuel. As the glycogen levels decline, you will ask your body to keep going. Yes, you will use all of your stamina and you will need something more to finish the race or just to keep a training promise. When your body runs out of gas you can ask it to keep going, to use the last gallon.

When your legs and lungs are ready to quit, you need endurance, the ability to endure pain. Fortunately, as you train your body to go the distance, you are also conditioning your mind. You learn that going on won’t kill you. You are learning to endure.

Stamina=physical Endurance=mental