Muscle endurance takes lots of proper exercise and correct nutrition.  Your muscles should be tired after your work out, and you should try to work different muscles every day of the week in order to train your body correctly.  Once you come back to the muscles that you had worked before, your muscles should be rested and ready to work hard and to the point of exhaustion.  It is important to warm up your body with some sort of cardio and stretching before training.  Remember it is important to eat a light meal within 30 minutes of your exercise.