I've never seen someone be crap or average in training then smash it up in comp, but some guys definitely perform their best in comp.
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Twitchboy- yes i have seen the opposite occur.Guys who look pretty average in training and turn into absolute animals in competition.
Regarding Competing often enough for it to become second nature.That never really happened with me in Jiu Jitsu because i never competed more than 4 or 5 times per year,however while fighting for my grades in Judo i attended a competitive grading every month and that was very very good for my mental ability to turn 'competition' into something approaching normal training.
You need some strength to make leverage work, you may have a fixed point and a fulcrum but you also need to load the end of the lever to create leverage, that's where your strength comes in.
If you can't do it against resistance then I think you aren't technically good. re Simon's example of Helio, in the case of someone who has done it against resistance and grown old and weakened physically I think that will generate someone who is extremely technical as they will hone their technique as their strength decreases.
Tribulus, do you think then someone who is not physically strong to begin with say a lightweight guy is forced to develop better technique from day one than someone who is natrually stronger and or bigger?