OK, simple task - hang on to the edge of the pool, put your head under, blow out water slowly, then pop up. Repeat 20 times.
I put my head under the water, and start to blow. I stop. I didn't want to stop, I just stopped.
Pop head up.
Blow. Stop. I don't get it, I still have air in my lungs, but my body has no interest in letting it go.
I got it going a bit after some practice, but not exactly feeling like 3.8km is right around the corner... :)
No bright spots really, my swimming is weak in just about every category.