From my experience,those who move with relative ease and one with the breath are usually exceedingly strong(in a gymnastic way),and have had a very solid strength training foundation..
With that said,I do believe one can achieve a "soft" internal strength that is 80-90% of an external "hard" strength with half the energy beieng expended.Thats not too shabby:)
I dont quite understand using springs correctly and how it relates to an advanced level.If one is truly advanced(and strong),there may not be a need for springs at all.At least thats my goal
those who do the advanced exercises and make them look effortless, they are relaxed, they look at ease, and the alignment is perfect, the breathing flows with the movements and it looks beautiful, rather than those who can do the exercises but you can "see" them maneuver or muscle through with a lot of excessive tension..
also understanding how to use the springs correctly, makes someone advanced in my mind
Edited by taowave, 03 September 2011 - 02:13 PM.