Science is that if you work out all major groups of muscles with maximum intensity you use up all of the stored ATP energy and trigger anaerobic energy delivery

Science is that if you work out all major groups of muscles with maximum intensity you use up all of the stored ATP energy and trigger anaerobic energy delivery mechanism which builds up lactic acid [0]. Do this for all major muscle groups and you get significantly raised metabolism throughout the day as your body deals with replenishing ATP, cleaning up lactic acid, and repairing small amount muscle micro tears. [0] http://en.wikipedia.org/wiki/Energy_systems http://en.wikipedia.org/wiki/Energy_systems