It was Gm Leo Fong a noted Martial Artist who shared this concept with me. He has used this in boxing, Chi-Fong and Modern Eskrima. This concept in one that sounds so simple of just being relaxed until you just about to hit. This concept sounds funny at first but when you realize that this will allow you to strike harder & faster and last longer when fighting sounds almost too good to be true. GM Leo showed me this using little weights just 3 pounds. This when coupled with Chi-build ing breathing exercise makes for a great workout and training. I have been doing a bit of boxing and everybody I box with says that I hit very hard and throw a lot of power punches. Recently I read an article on FMA Pulse that was about this subject. The author was trying to explain this and gave some examples, it made for good read.