Actually 'cardio' (I really hate that term for some reason) - Cardio Respiratory Endurance (ahh, that's better) - is a critical component of one's fitness level.
The way most people pursue it sucks... and is potentially unhealthy.
Here's a great primer on "real cardio" and why you should be scared if you don't know what interval training, the tabata protocol or a kettlebell is;
http://www.dragondoor.com/articler/mode3/543/?c=pbp-190&utm_nooverride=1
'Real Cardio'...
...and it's aftermath
"The notion that holding a heart rate of 180 bpm for twenty minutes on a bike is good cardio whereas holding 180 bpm for twenty minutes in a circuit of weightlifting is of lesser cardiovascular value is widespread yet ludicrous."
Coach Greg Glassman, founder CrossFit inc.
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