I think it's a stretch to say that they're lungfish just to try to f ind some way to fit into this thread. I think some are more like deer or horses that have to cross a river or lake while being pursued. And I don't mean sea horses.
OK, I am a deer stuck in a perpetual 2.5 year foray into trying to move upsteam in a turbulent river and failing rather miserably, but what he heck, I'll never be shaped like a dolphin!!!
So I arrived in Calgary and went for a swim at the Repsol center where they are having masters nationals which is conveniently a few km away from the home of my biz partner who is a co founder in my company (by the way, that guys is an ex 2:23 marathon stud, and used to beat the crap out of me on every run)....so I get the in the pool at 125m later something weird is going on....oh we're at 3500 ft....I realize it is still 90% of the oxygen at sea level, But I noticed it....I tried an easy 200 fly and there was not much "breathing every second stroke"....needed to breath every stroke and my underwater pull outs on breast stroke were not push-dolphin kick-pull breakout....more like light push-dolphin-brerak out.....just did not have much gas to last underwater. It's not much less oxygen, but when going hard, I really noticed it. My buddy who also used to do IM tris, claims that because your lungs are less inflated, your body position is not at high either...not sure that makes an impact, but I'll take his theory to justify my suckiness!!!
Tommorow morning swimming with RealAB...well, he's picking me up to take me to the pool and then he'll be swimming circles around me stationary flailing like a deer stuck in water!!! Pool is awesome....two 50m pools. I'll post some pics tomorrow.