This is indicative of modern-day Tai Chi where mistakes are made, no one is there to correct, it ends up being good exercise but it is definitely not Tai Chi. Classical Tai Chi has to be good for both health AND martial purposes. The martial teaches one to "stick" by first touching then following the opponent's movements. Why practitioners are not being corrected when the arm goes way behind the back and the hand is touching one's own body (which muddles your senses and one can infer they are training to follow only themselves, not an opponent) is indicative of modern Tai Chi. A good example of sticking shown in the video of Master Hwa is that in certain instances Tai Chi trains one to vigorously follow the opponent. For example in a Forum, Master Stephen Hwa said: (as shown in the video) " Tai Chi uses the ball of the foot to push off such as the skipping steps after Needle at Bottom of the Sea. This enables one to pursue the opponent quickly. The purpose is to maintain "sticking" to the opponent; not letting him get away from one's touch. It is not used to build a momentum of the body; that is against the principle of Tai Chi. Also, before the nineteenth century, the Chinese did not have the habit of inventing new words whenever new things came along. So, they not only borrowed old words for new uses but also avoided the use of misleading words. For example, a student mentioned “ting jin”. That literally means listening (ting) to the opponent’s power or force (jin). In other words, you will sense what the opponent is trying to do so one could respond accordingly. All senses are needed to get the information: touch and feel, look, and anticipation based on experience with that person. Early masters avoided the use of the word "feel". Because, if one uses the word “feel”, then students will concentrate on touch and feel, and lose out on developing other senses. So they picked a neutral, completely abstract word “listening” (ting) as a name"