I was asked this question during a workshop. We were discussing Mr Destin Sandlin, the person who unlearned cycling. By the way it took him 8 months to do that. Coming back to the question, we were in the early stages of the workshop, where we are discussing how our behaviour is based on our beliefs, the permanence of beliefs and how difficult it is to change them just like it's difficult to unlearn cycling or swimming and I gave the example of Mr Sandlin who unlearned riding a normal bike after several months of effort. It was then that the gentleman asked me this question. And it was a right question to ask that time. The answer was that he was tricked into riding a bicycle with reverse handle so that when he would turn the handlebar to the left, the cycle would veer to the right and vice-versa. When he couldn't ride it, he took it as a challenge and practised riding it daily for 8 months when he finally learnt how to ride it. But by then he had totally un-learned how to ride a normal bike and could not ride one. Though he could do it after some time with practise. And Mr Sandlin went on to say that this proved that knowledge doesn't mean understanding. We might know something but that doesn't mean we understand it enough to execute it. Like he knew how to ride the reverse handle cycle, to simply turn the handle to the left if he wanted to turn right but still could ride it because his mind wouldn't allow him to, as it was set or programmed to ride a different bike. His brain wiring just would not allow it.
And this has much wider implications. We stay in a connected world where we have all the knowledge about how to change, improve ourselves and achieve our life's goals. But our mind is set or programmed in the older ways so deeply that we find it impossible to implement that knowledge. Don't all of us know that if we make that one change in our life, we could achieve almost anything. But somehow one way or the other we find ourselves unable to do so. Could it be that our mind is programmed so deeply to behave in the old way that it's impossible for us to acquire the new one. May be our brain is wired to the old way and this wiring makes acquisition of the new behaviour difficult. So we may have the knowledge but execution might be a challenge.

Way out - one way to do it is Mr Sandlin's way - stop the old behaviour immediately and practise the new one daily for 5 minutes for months. But is it as easy as it sounds. Mr Sandlin could afford not to touch the old normal bike for months at a stretch, but it will be impossible for us to avoid such situations in our daily life where we want to behave differently. And as soon as we face such a situation we'll find ourselves behaving in the old way because of our programming and learning the new behaviour will become that much more difficult. Fortunately there are better ways available such as using mind techniques to change the wiring of the brain in 5 minutes. And learning these mind techniques is easy (with a little bit of practise if required). Pl. see a short video on how mind techniques can be used to do something which we believe we cannot do, our programming would not allow us. Like bending a steel spoon with one hand