The body’s ability to learn and improve explains why progressive stress must be applied for continued training improvements. When a training stress is placed upon the body, the body responds via a unified reaction of systems in varying proportions that attempt to manage the stress as efficiently as possible. Initial actions by the body are often distressed due to the lack of experience with internal management of the exercise. The metabolic systems try to deliver the appropriate amount of energy, while cardiopulmonary actions work to increase oxygen to active tissue.
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