There's the thing called the Aqua-Bike, but for athletes that don't do the run thing. It's like a duathlon (run-bike-run) except it's a swim-bike-swim.
I was on my way home from school, knowing that I wanted to run, but I also wanted to train for battle of waterloo, coming up in about 12 weeks.
Though I didn't have any of my summing gear, I did have my running shorts, my five fingers, and a pocket with a zipper. I had my heart rate monitor and Garmin 310. So I thought: why not?
I got to Pontiac Rec, threw on the appropriate gear, set the watch for multisport, and took off to the lake. I swam about 17 minutes (for abysmal swimmer me, that translates to about a third of a mile) ran to my car to pick up my sun glasses and hydration pack, ran 8.5 miles, dropped all that stuff off, and did the swim again, finishing where I started.
I was good- I actually found some sort of rhythm when I was in the water. I was struck by how I swim in 2D the way Woodstock from the Peanuts flies in 3D. And how swimming in five fingers wasn't so bad. I got them well and truly wet, did the run with no problem, and go them well and truly wet again.
Now all I have to do is figure out a comfortable way to bike in them...