Yeah..Chi Gung is a Part of Iron Shirt Training..Win Chun is an Internal Martial Arts System..There are Few that Teach it that Way these Days or have the Traditional Teachings..Win Chun is a Great System..Is it Iron Shirt type of stuff?
I used to cross-train with a few Wing Chun lads who were students of Derrek Frearson, Alan Orr, Larry Tuck, Mick Yates and others who were doing that sort of thing.
It's why Bruce Lee started up that Jeet Kun Do thing, the 'Way with no Way' because all the other styles were too traditional and formulaic, so he said. Anyway.....Did Wing Chun for a couple of months. Seemed very effective and efficient (within certain limits) from what I saw. Enjoyed some of their drills but the mentallity of the modern martial artist didn't sit very well with my own. If I deviated from the usual "you do this, then I do that" structure during free sparring (like chucking in a tai otshi or arm bar from my judo days) they'd get flumoxed, spit their dummies out and say I was cheating.
The lads who knew the score were good to train with though, and they gave as good as they got, we learned a bit from each other and became better all-rounders as a result.
My most interesting hobby these days is achieving regular bowel movements. Cheap as chips, but can be a strain...
JohnnyO. o/