rojcewiczj wrote:. Do you need to have huge muscles? no. Do you need to have highly trained muscles?
Ok, lets explain in pure physics:
Power = mass plus speed/acceleration. Speed is much more important than mass. Double the mass means double power, double Speed means four times the power. If you stop the speed with tension, you stop the transmission of force. If you want to maintain the transmission, your movement must continue into the target.
a knot in a string does not illustrate tension, a womens hair hanging strait from gravity is an image of tension
I guess it hangs up in the air by Magic? Maybe qi?
Ironically, the image of Song is more appropriate to illustrate tension then relaxation.
The image of song is a body in movement that moves freely and coordinated without unnecessary tension.
Honestly, I believe you should do some practice and testing by yourself.... This is not theory we are speaking about, but our own practical experience.