Cardio is a shorthand term for aerobic exercise. Aerobic exercise is comprised of activities that tend to improve the body's utilization of oxygen.

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How can I recover more quickly from leg-intensive cardio workouts?

It seems that every time I do a leg-intensive cardio workout, like stair climbing, intense elliptical machine, or running more than 3-4 miles, my legs take forever to bounce back. They don't hurt so ...
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For how long can I stop doing cardio training before losing my endurance?

I've heard that being ill for a few weeks or so is enough for your endurance to drop drastically. Is this really true?