While my left hand is distracting him, I score with my right. Now this is a technique anyone could use, even a white belt, and he wouldn't have to be a circus acrobat to perform this quite efficiently. What anyone needs is plenty of practice-repetitions of at least a couple of hundred times per day. I found shadow boxing was a very good way to master this technique. The most important single ingredient in being able to master a move of this sort is speed.
Power comes later.
The only way to develop speed, and eventually power, is by constant practice. This is why I and other Japanese instructors would rather make a student do 100,000 repetitions than teach him 100 new techniques, none of which he would be very effective with because he had not practiced them enough. I never use a roundhouse kick or a back kick. In both of these, a fighter leaves himself wide open and all an opponent has to do in either case is to jump forward, block the kick and start punching. In the case of the back kick, a fighter is particularly vulnerable with a wide-open expanse of back, an enticing target for an opponent's punches.