I have had an interesting experience wrt. this question.
Years ago when I had just started training in my style, I asked my sifu if working out was good for my kung fu. He said no.
At the start of this year when I joined a gym, I asked the same question and his reply was that weights etc. is OK as long as I keep practicing my kung fu and be careful not to damage certain tendons in the chest/shoulder area.
There are two explanations I can see for the two different answers.
The first is that my kung fu may have advanced to the point where doing weights etc. is not going to affect my kung fu as long as I keep practising (I guess the kung fu training will help me maintain my flexibility etc). Maybe my technique is good enough that I know better than to rely on brute strength so doing weights will not pose a problem.
The other reason may be that he has come a realisation about how to make weights and kung fu work together effectively.
Or it may be a combination of the two ![Smilie](images/smilies/smile.gif)
Seriously though, at least as far as Shaolin training goes, weight and body weight training was definitely a part of the curriculum.
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Behold, I see my father and mother.
I see all my dead relatives seated.
I see my master seated in Paradise and Paradise is beautiful and green; with him are men and boy servants.
He calls me. Take me to him.