Depends on what you want
Hi Ish,
Each placement offers certain things.
For example if one turns on the Balls of the foot you will end up closer to your opponent. It is a little more aggressive. However, you also run the risk of putting your weight too far forward and this can be taken advantage of by a skilled opponent. He will draw you in and then use your momentum to aid him in pulling you forward and off balance. If done properly though you can augment the power of your punch with a little more forward energy, of course you should be striking from the ground already so this can me nominal.
Turning on the Center of the foot gives you the most contact area when turning. Many people will argue that the center of the foot or K-1 point is where the body weight is centered and therefore it makes sense to turn on or as close as possible to this point. I am not sure I agree with this theory. I think that turning on the center provides more surface area and can allow you to react a little more slowly since you can fluctuate between heels and toes in a pinch. The more surface area one has the better ones stability, or so it can be argued. Turning in this manner also tends to keep the distance between you and the opponent about the same as you started at.
Turning on the Heels tends to draw one a bit further away from the attack. This can be seen as a measure of safety when dealing with a strong opponent. Another thing to consider is the surface you are fighting on. Turning on the heel will allow you to skim some things like loose gravel etc and still keep your structure.
So to summarize:
Turning on the Balls of the foot can decrease the distance between you and the opponent. It can bring your weight forward and towards the opponent. It is a bit more aggressive.
Turning on the Center of the foot is more passive and allows you to keep your weight centered. It will maintain the distance between you and the opponent. It provides the largest area of contact between you and the ground but for this very reason can also be considered slower.
Turning on the Heels can be used to increase the distance slightly between you and the opponent. However, you can also turn rapidly while maintaining structure and root.
It is my opinion that the weight of the body does not reside or rest on the K-1 Point or center of the foot. I feel that the weight is actually closer to the heel. The remainder of the foot provides the area needed to provide stability. I know that several people will disagree with me on this, but I am used to that
, however if one examines the structure of the human body while standing then one will find that the leg drops into the heel area of the foot not the center. If one takes a stance and moves the knees forward then you can argue that they are placed over center but the physical link with the leg is broken. In other words, when I assume my stance my knees are in front of my heels but my weight is actually sinking through my legs into my heels or pretty close to it. I find that I am able to sink my weight and root at this point easier than at the Center of the foot. Of course, this is my experience and others may feel differently.
Now to make this even more fun you may also want to consider the method of turning. In other words do you turn one foot at a time or both together? This has an effect on how the turning works. What I always suggest is to experiment with all the different ways and see what feels best for you. Bottom line is if you can make it work for you then it is most likley the right way. I personaly tend to turn more on my heels and like turning both feet at the same time. I find it is faster and allows me to deal with minor obstructions on the ground. However, turning one foot at a time, while slower, can provide greater stability and ability to resist more pressure.
It all depends on what you want to do and whether or not you can make it work. Play around with different methods and let your body tell you what is best.
Peace,
Dave