In high school I got into running. Training the body is sort of like programming a computer: if you train effectively, you will have predictable results. Well, all summer long, I have been programming my body for yesterday's Los Angeles Triathlon, and I'm happy to say, the program executed as planned.
The body is an awesome machine.
And while not triathlon related, another machine I really dig is this cool Curta mechanical calculator (designed in the 30-40s, no electricity required to operate!). You basically have to 'program' it to get it to do simple math for you, but it would flawlessly execute arithmetic and beyond.

Photo by Rick Spaulding, Found on the Curta Home Page