I tried rowing once, for fun, with a friend who was in the canoe/kayak club across the lake where I stayed for a couple of summers with my Aunt.
I was in good shape then and I thought I was doing pretty well, coordination wise. Well at least for a while until they really poured it on. Then I couldn't power through a long stroke fast enough to keep up. I flailed along with clumsy, shorter strokes so I didn't bang my oars against theirs. It wasn't pretty. Not pretty at all.