If you have been strictly doing the same cardiovascular exercise at the same moderate pace everyday for years and years, your body has also adapted to a large extent and become very efficient at doing the elliptical at this pace. You need to create some type of stress overload for the cardiovascular system in order to keep getting positive adaptations. Doing the same machine at the same pace for years is no different from someone doing the same lifts using the same weights for years on end.
The principle of progressive overload applies to all training.
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