What is cardio/lung capacity/vo2 fitness?

Soldato
Joined
17 Jun 2012
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11,259
What does it actually mean in physical terms. Obviously you're can run, or whatever sport, longer or faster but what's actually happening under the hood?

Definition of lung.

Their function in the respiratory system is to extract oxygen from the atmosphere and transfer it into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere
.

Is the lung just a muscle like the bicep that has to be strengthened, or is it actually to do with how fast the heart can pump blood around the body or what?

At the moment for example I'm gasping for breath after one third of a mile running(mild smoker for years also).

If I trained and trained that gasping would reduce and reduce so am I making the lung bigger.

If I were to take say oxygen from a tank before running would it help?
 
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