As mentioned previously, if the gripping action of the toes and feet can be described as Go, the pliability of the ankles characterises Ju. Likewise, the muscles of the legs maintain a state of firmness throughout Sanchin kata, and this can be considered Go, whereas the Ju partner to this applies to the knees.
The knee joints can be considered the shock absorbers of the human body, as can the ankles. If the knee joints are locked out and held rigid in your stance, you will find that any power travelling down into your feet will be immediately bounced back up into your upper body as it has nowhere else to disperse. This is particularly evident during sanchin shime, and this is what the sensei is checking for when he slaps down upon the practitioners shoulders. Alternatively, if the knee joints are held too relaxed, the downward force will cause the practitioners structure to collapse from the ground up. There has to be a healthy balance, not too hard, not too soft; just goju.
The various knee exercises found in junbi undo work to promote flexibility and mobility in the joints, as well as developing the method of explosive power generation for kicking techniques.
In the exercise where we strike the hiza geri up into the palms of our hands, it is important to initiate the movement with the toes of the striking leg. The toes push down into the ground to initiate the movement of the ankle joint. As this happens you should sharply thrust your foot to point downwards, fully extending the calf muscle and stretching out the ankle. The toes continue to push off against the ground during this movement. As the knee is shot quickly upward toward its target, put power into the palm of the hand, linking it with the muscles of the back and the tanden. As the hiza geri connects with the palm, feel the circuit from your striking knee into the palm, through the arm and over the back, into the tanden and finally down the supporting leg into the ground. Repeating this exercise often will allow the practitioner to develop a feeling for the correct initiation of movement which applies to the majority of kicking techniques in Goju Ryu. In addition to this, the practitioner will begin to learn how to channel power down through the body and into the ground in relation to kicking techniques. More will be discussed in relation to this concept when we look at Sanchin kata at a later stage.
Why am I making such a big deal about beginning all kicking movements with this downward action of the toes and ankles? Have you ever wondered why a point is made of pointing the toes downward when striking with hiza geri? Why bother doing this, when you’re only going to have to change the angle of the ankle and toes when kicking mae geri or kansetsu geri anyway? This is particularly evident in saifa kata. I firmly believe that this method enables the practitioner to kick with more speed and power.
Higaonna Kanryo sensei was particularly famous for his fast footwork and kicking ability, hence his nickname Ashi no To‘onna (legs Higaonna). Considering that we do not have any spectacular kicking methods within the kata of Goju Ryu, Higaonna sensei must have been quite something in this regard! The leg is a big cumbersome, heavy old unit, and to move it with any great speed is quite difficult when we rely solely upon the muscles of the upper leg and hips. Pushing off with the toes and ankles as I have described gives the larger muscles a head start and takes away some of the load. Like trying to roll a heavy great rock, once its already moving its fairly easy, but it’s getting it moving that is the problem. Initiating the movement as described might be just the thing to start the rock rolling.
In our junbi undo, in addition to striking upward with hiza geri, we also perform an exercise where we strike backward with the heel into our palms which are held to or rear, level with the buttocks. It is obvious to draw similarities between this technique, and the similar technique found in seisan kata, and we can visualise striking backward into the groin of an opponent who has seized us from behind. This is of course entirely relevant, however it is equally important to consider the relationship between this movement and the method of withdrawing a leg which has performed mae geri.
Like uraken uchi, when striking with mae geri equal importance should be placed upon both the extension of the kick as well as the retraction. Like flicking a towel, it is the sharp withdrawal that puts the sting into the kick and leaves the power inside the opponent as opposed to through the opponent. Mae geri is not the same as a Thai push kick. We are not trying to force an opponent backward to make ground, this will only serve to take us back to square one in that he will immediately resume coming toward us. When striking mae geri we are intending to finish the opponent there and then by causing significant trauma to their internal organs or the skeletal structure surrounding them.
In addition to this, the fast withdrawal of the kick is vitally important should our kick not be as effective as we had hoped, after all, things rarely go according to plan. The longer our kick remains extended, the more likely it is that an opponent will trap our leg. Our intention must be to have our leg off the ground for as little amount of time as possible. The kata of Goju Ryu are quite reserved with regards to kicking, and rightfully so, for our balance is obviously severely compromised whilst standing on one leg.
Back to the exercise, as we strike backward with the heel, concentrate upon leading the movement with the contraction of the hamstring. You should endeavour to perform the movement as fast as possible with a view of developing a feeling that can be applied to the withdrawal of your kicking techniques. On occasion it may be helpful to your practise to perform a number of repetitions of this exercise, and then immediately begin a number of repetitions of mae geri with a view of developing the feeling of quickly withdrawing the kick by bringing the heel back to the buttock.
From the two basic junbi undo exercises explained above you should hopefully notice that two things are happening at once. Not only are the knee joints being exercised by the various bends and extensions of the legs during the movements, but in addition to this, basic methods of technique delivery and retrieval are also being practised. Combined with the refinement of the striking tools used in our kicking methods as described in the section dedicated to the ankles, we can now begin to link the chain together from ground to target and back to the ground. All that is missing now are the hips.