its all in the feeling baby
for me, good structure boils down to how doing something feels.
i was lucky enough to have a sifu who would go over just bong/tan/fook with me for hours, just so i could get it right. who would break down dan chi sau/chi sau into its smallest bits and get us to find what structure really was:
bong sau - no good!
bong sau - no good! try this!
bong sau - no good! try again!
bong sau - better! try again!
bong sau - better! try again
bong sau - nope!
bong sau - good!
and so on and so on and so on and so on and so on
what this left me with was a good general feeling of what "structure" is. sure you can describe in in terms of bones and tendons and such, but once you got the feeling thats the best way to make sure you always have structure.
with a bong/fook structure feels like my body/core is effortlessly immoveable/unstoppable and my bong/fook effortlessly redirects/jams (bong) or absorbs/redirects (fook).
wtih a tan sau structure my body and tan sau feel effortlessly immoveable and unstoppable.
when practicing wing chun, i try to make sure i always have this feeling of structure.
Travis
structure in motion