So, I didn't make it to the stationary bike, but instead I went to the pool and did my first swimming workout. All I can say is that it's a good thing I have 6 months to train for this! Phew!
The pool is apparently 25 yards long. I went one length as kind of a warmup (after attempting to swim and failing after three strokes), doing a mish-mash of freestyle, breaststroke, and underwater breaststroke. I had to stop to catch my breath at the end. Then I came back breaststroke the whole way, caught my breath again, went out freestyle, rested, came back breaststroke, rested, then did a there-and-back all freestyle with a short rest in the middle. I was still breathing hard ten minutes after getting out of the pool! This morning my pecs and triceps are sore.
I had trouble remembering how to breathe correctly. I kept getting big mouthfuls of water, or lifting my head too high. Then when I started to get out of breath, I would feel like my legs were sinking too far. By the end I think I had my freestyle a little more under control, but this is going to take a LOT of work.
This morning: c25k w4d2, done! I'm bumping the missed bike ride to replace Thursday's planned swim.
Edit - so the triathlon registration wanted me to give my 100-meter estimated swim time. I put 12 minutes as just a random guess. Doing my last lap at the pool last night, which was 50 yards total, took me 2 or 4 minutes (I can't remember now). Do you think I should change my estimate? They seed people's entry times into the pool based on speed.