Ok, maybe they truly aren't prerequisites, but these things certainly seem essential.
You've got to be able to bend… your ankles, knees, and hips!
Hold your back upright, with proper posture.
Hold your back straight, with proper poster, while sitting.
Sit, with a straight back, and lean forward 20 degrees, and then lean back 10 degrees!
Rowing also uses the arms, you'll need to move your shoulders, elbows, and wrists in a rowing motion. You can try this out on an erg or doing the "rowing" lift, with a light weight bar.
