hi stefan
I don’t know what cd it is, but I remember bruce showing us this at a taiji seminar. I really dug it.
practice the movements but instead of focusing on the alignment (metal) just let everything relax and flow (water).
personally I had a lot of misalignments, so my movement was pretty awful looking, but it was very helpful in terms of allowing the movement, and it helped me to improve my alignments over time by helping me become aware of them.
I continue to use this practice, both personally and in my teaching, and it’s a great way to loosen up a practice session, sometimes you get too focused on doing it “right”, a little screwup taiji helps loosen up your expectations and judgements as well as your tissue.
hope this helps
richard