Cardio and fitness: It would be difficult to train to stay fit if the cardiovascular system was in poor shape so it is very important.
Answered 12/25/2012
5.4k views
Very: It is the engine that powers the body. You cannot be fit without a good cv system. Energy, fluids, nutrients, chemistry, oxygen, etc. All delivered through this system.
Answered 1/25/2014
5.4k views
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