RobB

Has anyone had any experience with his teaching or his online courses?

Depends what you mean by 'jing'. I think you could say that ma bu (horse stance) practice develops the jing if you mean jing as the connected tissue network of the body. ma bu practice can develop a 'stretchy' sort of feeling in the body. Ma bu burns because it's painful :-)

Usual disclaimer: don't take health advice from strangers on the internet: :-) That said: Wind invasion hits the Bladder sinews first. You might find it useful to try and encourage sweating: Ginger tea, a good sauna, light exercise (but stay wrapped up). Some stretching, twisting, yi jin jing type movements may help. Back massage/cupping/gua sha to clear the channel all good. Stay warm & hydrated. An acupuncturist should be able to help - they should keep their treatment room warm! Your cold aversion might be a symptom of your situation.