Video link to Fajin effects
Note Master Hwa's perpendicular stance to Tom's leaning. Without superb ability to "tense and instant relax" how else do you think Master Hwa does not get knocked back because of Newton's 3rd law? A student made a very insightful comment about the true pragmatic nature of "tension and relaxation" saying: "Most excellent explanation! Thank you! And too, if we could only apply this principle to everything we do in our life - to every movement to every thought to every emotion, life would flow much easier." and Master Hwa replied: Excellent!! You have grasped the philosophy in this practice"