Well, like I said to Bossman, to a beginner, every martial art is the same.
These would seem to be underlying physical 'rules' applicable to Goju:In motion
all parts of the body must be
light
nimble
and strung together.
Let the postures be without
breaks or holes,
hollows or projections,
or discontinuities and continuities of form.
The motion should be rooted in the feet,
released through the legs,
controlled by the waist,
and manifested through the fingers.
The feet, legs and waist
must act together simultaneously,
so that while stepping forward or back
the timing and position are correct.
If the timing and position are not correct,
the body becomes disordered,
and the defect must be sought
in the legs and waist.
P'eng (wardoff), lu (rollback),
chi (press), an (push),
ts'ai (pull), lieh (split),
tsou (elbow), k'ao (shoulder),
are the eight trigrams.
These are mind instructions:Up or down,
front or back,
left or right, are all the same.
These are all i (mind) and not external.
If there is up, there is down;
if there is forward, then there is backward;
if there is left, then there is right.
If the i wants to move up,
it contains at the same time
the downward idea.
And these ideas are used to design the form/kata:Step forward, step back,
look left, look right,
and central equilibrium
are the five elements.
P'eng, lu, chi, an are ch'ien, k'un, k'an, li,
and are the four cardinal directions.
Ts'ai, lieh, tsou, k'ao, are sun, chen, tui, ken,
and are the four diagonal directions.
Step forward, step back,
look left, look right,
and central equilibrium
are metal, wood, water, fire and earth.
Together
these comprise the thirteen postures.