But "handedness" varies among individual's paired systems (feet, hand, eyes). Some people, like my son, are totally cross wired on dominance. People who are good right handed basketball shots are usually right eye dominant (Michael Jordan), but make poor baseball hitters, where righties need to be left eye dominant (the eye with unobstructed view of the pitcher). Most righties jump off their left, dominant foot, but some use right, and a few can only jump using both feet simultaneously. Etc. But I agree, most people can be trained to use non-dominant side effectively.