I'm at the pool. Eltham leisure centre to be exact.
I'm up at the deep end. I've decided that I'm going to swim all the way to the other side - underwater. It's quite a test. I do freestyle.
At first I think it's going to be very easy, and it is. I feel a sense of pride about how I'm going, that I'm going to make it to the other side. I wonder if I didn't underestimate - maybe this time, or the next time I could do a lap up, and a lap back.
Yet as I get to about the 80% mark, I can feel my oxygen running low. I'm no longer moving breezily through the water. The lack of oxygen's getting to me, and I get the impression I'm not travelling a straight line any more. I tell myself I can do this though, and am so happy that I actually make it to the other side.
I look back, and am surprised to see myself on the final lane - near the exist stairs. I actually crossed to the other lane in the process. My thoughts were so focused on getting to the end that I didn't realise. I think to myself that I'll have to watch out for that next time I try this.
