Morning,
Thought I would post a few things conisdering some of the things already having been posted.
1. Does the Jong represent a human body? Not really, at least not in any sense of a sparring dummy with the body and arms representing how an opponent stands or how the body will be in position. However, the jong does represent, or perhaps I should say can represent, various parts of the body segments in specific applications. For example, the upper dummy arms can be thought of as the portion of the upper human arm from the elbow back to or even forward to the wrist, depending on technique applied (Taun or Bong and Pak Sau. These do not really represent a punch per se but are more for refining the position of your technique and help show
where contact should be as well as refine the angle. Another reason that the arms really can't be said to represent an opponent is that the arms which are not in contact at the time at times "no longer matter as though they do not exist". For example lets say you use your right arm to Pak to the inside of the right (as facing you) you dummy arm. In this instance you would not be concerned with the left dummy arm and it would not in essence exist at that time. However, having said that, there are times when both arms would be in play and in such a case your body position and angle should insure you are out of the line of both. There is a lot more to this than this simple explanation but perhaps this can provide a start.
2. The height of the dummy is an important conisderation but I do not believe it is a racist thing
. Different people are different heights, even if of the same race. The dummy was originally made for Yip Man and his body structure, this is one reason why, if one has the money etc. it is a good idea to provide your measurements and have a dummy custom made for you. When playing the dummy your stance should put your upper chest in line with the two upper arms, or at least that is how I was taught. With this in mind, setting the height of your dummy at a lower position will help you train a lower stance and placing it higher will help to train to apply against taller opponents. Also, having a dummy with adjustable height can allow more than one person to use the same dummy and adjust it to fit thier body.
3. The dummy may not "teach" us anything. However I do believe that proper training on the dummy will go a long way to refining our skills. I also believe that working the dummy may result in an AH HA moment where something is made clearer.
4. I think that in real fights attacks to the body do more damage and have caused more knockouts than headshots. Look at Boxing and you can find some real nice bodyshot knockouts, of course there are headshots as well.
A funny thing to me is that many are headhunters when doing Chi Sau
Anyhow, those are some thoughts early in the morning as I prepare to make my kids breakfast and run them to school. Enjoy the rest of your day.