Tai Chi Borrowing Power
This video shows a Taijiquan (Tai Chi) exercise for practising “Borrowing Power”
Borrowing Power is the ability to connect the opponent’s force to the earth, combine it with your own power, and redirect it back into them. It is the art of conserving momentum (p=mv) with minimal energetic output. We employ different types of levers within the body, and must have fairly good core strength.
Relaxation is key.
Any attempt to use local muscle force will break the connection and cause inelastic collisions. Momentum would be lost and our structure would be broken.
One must practice the tai chi form and/or zhan zhuang for several months in order for this power to manifest naturally.
What you see in this video is a relatively low-level version of borrowing power. With higher levels of skill, one can be almost upright on one leg, and issue power that blasts the opponent backwards.
This is not magic. It is basic Newtonian mechanics. The skill is rare, only because the method is so counter-intuitive.