It was suggested on another thread that it would be more appropriate to discuss TTCS postures in relation to Traditional Yang Family postures on a new thread. So let me be the first to post. A couple of the main precepts of TTC is that in a bow stance, the heels should be on the same line, and the hips should be squared to the front. The flaw in this can be seen immediately in Single Whip. Squaring of the hips in combination with the heels on the same line immediately means that you have closed the kuas. In TTCS Single Whip, the right hook hand is at 90 degrees in relation to the left. In other words straight out to the side. In this posture, get someone to push on your hook hand and see how stable your posture is!!!! In Traditional Yang, the heels are separated by some 9 - 12 inches, the right hip is opened to the rear and the right hook hand is over the back leg. The left elbow is above the left knee. Now get someone to push on your hook hand and see the push straight go into the front leg. Closed kuas and instability in Single Whip are enough to get going with and this post is already long enough. Very best wishes.