Cross-training different energy systems is the best way to achieve a better level of fitness. Routines differ so the body can not adapt to one particular system. The more varied the "routine", the better the workout. Changing workout routines and energy systems causes the body to adapt to different modes and recover quicker. This will lead to a well-rounded state of physical conditioning and a higher fitness level.
http://hubpages.com/health/GET-FIT-The-Exercise-Plan-for-14-20-August
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