Not that this applies to the OP...I am fairly sure that the more in shape you are, the less of an air hog you will be (once you calm down that is, and aren't a freaked out newbie)
Actually, there is a point in fitness/exercise where the body becomes a high horsepower machine. A '68 GTO w/6-pack is so strong it can climb gentle hills at just an idle, while a Neon will have problems moving at idle on level ground. Leave those cars parked at idle and the GTO uses way more fuel. Similarly, a very in shape person (pro athlete) has a significant O2 requirement even at rest. A very few people will only improve air consumption by getting a little softer (less muscle).