...but, tension isn't the same thing as being stiff or rigid. it's a type of elasticness. you start out drawing your circles loosley, then you start winding them tighter into softness and then tighter still into elasticness, then you can draw them tighter still and then release (fa jin
What you wrote above makes more sense, then what might be typically meant by "tension". For instance, I would refer to it as "taking out the slack" (a by-product term from my aikido upbringing
) and it's not a muscular thing. However, shouldn't any
type of exercise have "taking out the slack" as a requirement? This is where the distinction between hard and soft sometimes gets lost on me. 'cause what Sam Chin displays in the video looks like good, soft training to me.