I think that somebody doing some background research into “Tai Chi” inevitably ends up looking at a picture of the “acupuncture meridians” and starts to wonder how they relate to Tai Chi Chuan.
The meridians are used in traditional Chinese medicine practices like acupuncture, massage and pulse diagnosis.
It’s very easy to jump to the conclusion that specific moves in Tai Chi Chuan must affect specific meridians (since, you know, they’re both Chinese…), and indeed a lot of Tai Chi literature will tell you things like this – for example, you’ll see it written that Wave Hands Like Clouds works on the belt meridian or Needle At Sea Bottom works on the bladder meridian.
Do they really? Who knows.
I remember asking my Tai Chi teacher about this and he just brushed it off as unimportant. He was right, too. The thing is, when you do an opening outwards movement, Qi (if there is such a thing, and if there is, then it’s probably not what you think it is) is moving through all the meridians equally in an outward direction, and when you do a closing movement it moves equally through them all in an inward direction. This sequence of opening moves turning into closing moves, which turn again into opening moves, and so on, is repeated throughout all Tai Chi Chuan forms, and is therefore the key feature of the art, and where it gets its name – you continually move from Yin to Yang to Yin to Yang, etc…
You don’t need to worry about the acupuncture meridians for practical considerations. The meridians are not exactly the same as the muscle tendon sinew channels (Jing Jin) first described in the Yellow Emperor’s Inner Classic (Huang Di Nei Jing) that Chinese experts will talk about. The meridians are more modern, and roughly drawn over the top of the old channels (so are useful for illustrating a general concept, like their same sidedness, for example) but they’re more detailed/fiddly, and not as useful for practical work because of that. You need broader brush strokes.
In internal martial arts you want to develop the connections in the muscle sinew channels so you can actually feel them. You’re starting point for developing these connections would be to use open and close movements. So (generally) the channels that go up the outside of the legs and up the back of the body are used for ‘opening’ and the ones on the front of the body are for ‘closing’ movements.
Using reverse breathing you try and feel a slight tension on the surface of the body and turn that into an opening outward, or a pulling inward, sensation, matched with the movement. (E.g. I breathe in and try and feel a pull along the ‘close’ channels of my arm, and let that lead my movement). You need to let this connection become the driver of the movement, taking over from the local muscles. Your shoulders are usually a source of problems, as is relaxing the lower back sufficiently. Remember to drive power (Jin) from the lower body (closest to the ground). Connections start gossamer thin and build up over time.
Any Tai Chi form movement would work for this, so find one you are familiar with and open up the back and close down the front. However, if I were to pick a movement to start with then a single arm silk reel would make most sense. Like this:
I believe this is the basic path.
Alternatively (using the way most of us Westerners get taught) people learn lots of forms, techniques and exercises that make them feel like they know a lot, but then in 20 years they might meet an expert and realise that they didn’t start with the basics…