I agree, that taiji is a serious martial art, although I can understand that most teachers put their main emphasis on the health aspect of it. In most places we have a very good functioning law enforcement system, so one does not need to worry much about personal security (although the media tries to make a different impression). On the other hand, many people suffer from chronic stress-symptoms and back pain, and here taiji is a great boon, even without the martial aspect (much more so with the martial aspect, but that is hard to understand at first).
The way I learned martial art was by way of application .....do this, break that.......shove here, punch there to drive a broken rib into the lung-area.....step this way to smash opponents knee into the ground and do that to deliver a neck-trauma, etc. Needless to say, we trained only so far, and not to actual "ripping-appart" someone, but heavy bruises and sprains where common.
When I changed to taiji I was able to bring all that knowledge over to the "soft side" of the fighting arts and when asking the different masters and teachers about it, they agreed upon the useability this techniques but suggested extreme caution while using them in taiji. Since I began to understand the mechanisms of fa-jin I know why *bg*.
So I teach my students in this way ever since, the five ways to deliver blows with the closed fist, open hand strikes and finger punches, ellbow and kneestrikes, hip- and shouldertechniques, headbuts, takedown, peeling-the-skin-off techniques along with chin-na and nerve pressure points (I have a doctor in my staff, he is one hell of a guy when it comes to finding these spots even in combat - medical studies do pay of *bg*).
The difficult thing is to lead them to do it in an utmost relaxed and calm way, with maximum relaxed big muscle groups and strong as hell tendons and ligament, but they like it and also like the hightened health benifit in comparison to "only-energy-taichi".
When I finaly met my master, someone I was serching for over 10 years, I found out that this way of training exists since a long time in the yang family, and the last great master in "my" lineage had the saying: "Not to hit is not to teach"

I like that
