Cardiovascular exercise frequently referred to as "cardio" or "aerobics" creates a continuous durational challenge on the heart. Usually done without rest. This mimics prolonged stress in a native environment. The heart feels like its under constant threat and attack. "Cardio" exercise is a waste of time and effort. The birth of long distance running, began with the ancient Greek long-distance messenger, Phidippides. He ran 26.2 miles from Marathon to Athens to tell of the victory of the Greeks over invading Persians. On his arrival, all he could master from the long distance he had run was "Nike!" (meaning Victory) then collapsed and checked out (died).
Forcing the body to perform the same continuous cardiovascular challenge, by repeating the same movement, at the same rate, thousands of times over without variation and without rest is unnatural. When looked at from an evolutionary perspective, this type of demand could have rarely happened.
Read more: http://www.blogspottutz.blogspot.in/2012/11/in-this-tutorial-you-will-learn-how-to_3.html#ixzz2OmiUjlME
