@Submariner- Endurance training can be separated into a few categories. Aerobic training consists of exercises that are done at a pace where the trainee is introducing enough oxygen and fuel into the body at a sustainable rate. Continuous aerobic endurance routines help to improve your oxygen uptake, while interval training help improve the hearts ability to pump blood.
While aerobic training is better suited for marathon training, anaerobic training is best suited for sprints. This type of training focuses on improving how long the body can perform while in oxygen debt. Anaerobic endurance training workouts will push the body near the limit of failure through repetitious high intensity/short recovery workouts.
I would suggest reading a book about endurance training workouts, then seeking the services of a personal trainer. This way you can design a safe workout that you will be able to stick to.