The point I was trying to make is that most people have a preferred hand and foot, though not always on the same side. It's an innate thing that exists in other animals as well. (A science project I did as a kid showed that most cats are left-pawed, at least when it comes to striking at a target.) That's not to say they can't learn to use their weaker hand or foot. It just takes more effort and concious thought than it does on the stronger side. Whether they are willing and able to put out that effort is another matter.
However, there are people who have no preference, conciously or unconciously. It's not a skill they developed over the years; it's something they were born with. Hence, it's an innate ability.