The movements are light, agile, and "sticking"—similar to the principles of Push Hands. It trains the practitioner to project their Qi (energy) to the very tip of the blade. 3. The Broadsword or Knife (Taiji Dao)
The weight of the weapon (even a light practice one) strengthens the wrists, shoulders, and back.
The Broadsword (often referred to in Chinese as a "Knife" due to its single edge) offers a stark contrast to the straight sword. It is generally faster, more powerful, and more "earthy."
Discovering Balance: A Guide to Yang Style Tai Chi Chuan, Sword, and Knife