Aloha snake,
There are thousands of qigong exercises. The ones Master Lin included in the level I course are those he found to be the most powerful, simple, and covered healing of the entire body.
Looking at those exercises as a whole, I'd say he has plenty of spinal or "twisting" exercises. I can hear him say "There are a lot of good ones out there, but why do 10, 20, or 30 when 1 or two will do the same thing? Stay simple.
Much Love,
Shawn
[This message has been edited by Shawn_Grim (edited December 29, 2004).]