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Bear with me for a moment.
When we were growing up, my older brother could eat at least twice as much food as anyone else in the house. He would finish his food, take second servings of everything, scrape dad's plate (OK, not really) and ask for more as we all left the dinner table.
To this day, the guy is as skinny as a pole. He just doesn't gain weight, no matter how much chow he puts away. Naturally, we nicknamed him Second Stomach (well, something like that, but just play along).
But, honestly, Second Stomach comes nowhere close to the coolness of Third Lung. That's the nickname of QPR midfielder Ji-Sung Park, for obvious reasons.
Sweet as it is, it would be cooler if Park could use that third lung to breathe underwater or something. As it stands, he'll just have to settle for being a tireless midfield worker.