Wing Chun Buddhism Zen Stance - Standing Meditation

I understand the Martial Arts namely Wing Chun basic stance has a form of meditation. I understand Grand master Yip Man or Bruce Lee's master already modified it so it's easier to be absorbed and learned by public. Qi Gong or breathing technique been removed from syllabus as i understand. There are too many versions and theories about this stance and breathing/meditation technique when i search online. Anyone can share the closest original info about this stance meditation and breathing technique?