"Paul Vunak - Isometric Strength"
Reminded me of an old friend I knew in high school in the 70s who studied Wing Chun, under Chris Chan.
They practiced what was called "dynamic tension" said to increase power and speed.
https://www.youtube.com/watch?v=2Y3OnMnaHiw
Sifu Yao Performs Siu Nim Tao at Chris Chan's
Market St. School in Downtown San Francisco, Circa early 1990s.
Shifu, Chris Chan, narrating, coaching the demo
True Wing Chun Power
The secret of dynamic tension training in the Wing Chun kung fu system as taught by Grandmaster Chris Chan, student of the late Great Grandmaster Yip Man. Through dynamic tension you will MORE THAN DOUBLE your internal power by training in as little as 5 minutes per day!
https://www.wingchundynamics.com/sifu-ken-chun
While interesting totally opposite of the type of force that taiji develops...
Some history of Chan, shifu..
Watched him do some wooden dummy work long ago,,
quite impressive...at the time..
Grandmaster Chris Chan
It is not very well known that Grandmaster Chan was actually a close friend, classmate, and training partner of the late famous Bruce Lee.
During the 1960s, the two of them were well known for stirring up challenge matches with formal karate and kung fu instructors throughout the San Francisco area.
It was also during those times that Grandmaster Chan and his close students would venture out on “field trips” to test their fighting skills in the bars, pool halls, and the streets of San Francisco. Grandmaster Chan and Bruce Lee were the first kung fu instructors to break the barrier and teach the Chinese martial arts to the American public.
They are credited with introducing and demonstrating the short-distance power technique which they later coined the term of “one-inch power”.
https://www.wingchundynamics.com/sifu-ken-chun