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Cardio-Respiratory fitness is all about developing your heart and lungs to prolonged rigorous exercises without getting stressed or without getting exhausted. So the more you engage into physical exercise, the more your heart and lungs biogenix rx get used to it and is able to adapt to the condition it is going through. Circuit training is a whole body exercise program where in it aims to develop not just the cardio-respiratory aspect of the body but as well as the muscles of the human body. However, achieving results does not take overnight. It takes ample time and consistency. You cannot expect to improve your stamina and endurance just by doing it once in a week or once a day...