More & more research is showing how high level, interval type training (and that refers to any type of high level/high intensity work) will develop the same if not better results as low or moderate level endurance effort. Basically, you can get done in 10-15 minutes what 45 minutes or more can do if you're willing to work hard.....and without the related overuse injuries that accompany such activity.
SAFE - EFFICIENT - EFFECTIVE.......Premiere Personal Fitness