The Energy Systems
Instead of using the term "cardio", strength & conditioning coach Mark Verstegan uses the term "Energy System Development" or ESD. We use that term a lot at the Epicenter Sports Performance Center. It means that you're not just conditioning to get in shape, or you're not burning calories just to burn calories, but you're also training specifically for the sport that you're competing in plus the individual that is training for general fitness is also training the heart, lungs, and building short and long term endurance at the same time.
I remember when I was in college at Appalachian State University (almost 30 years ago), I learned one of the most valuable principles in training and still use it in our programs today. The S.A.I.D. or Specific Adaptations to Imposed Demands that I am referring to simply means that however you train, your body will adapt physically to those specific demands that have been placed on it. In other words, have you ever seen a fat sprinter? Because sprinting burns a tremendous of calories and speeds up the metabolic process at a very high rate the body gets lean to help it meet the demands that are put on it by the type of training program that is prescribed.
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