Garg, though knowledgeable in his field, didn't seem to comprehend the title of the thread.
OK, they're adjustable footrests, not pedals per se. They are pretty darn useful--in a KAYAK. Actually I recall I have seen some kind of foot-pedal-propelled kayak-thing, but I don't see it catching on.
Hey, I lied. Instead of going paddling I washed the dishes. Now it's snowing like crazy. Frig.