T-God, The truth is you could not be more incorrect if u tried. On house shouts go ahead and muscle up all you want, however when one gets to more difficult conditions the obvious will show itself. A free "Consistent" arm swing is better and more advantageous. Under pressure and other elements (tough conditions) the muscled swing becomes VERY inconsistent. Think of it this way. Imagine playing baseball, golf or any other sport that involves swinging a bat, club or racket. Tense up as much as you can and hit the ball. Every once in a while you will have a great shot, but all in all you are inconsistent and you will get less quality distance or shots in that manner. Now take a fluid, quick swing and watch the results. Distance, control and repeatability. Plus with the muscled swing you will tire more rapidly.
Free, relaxed, fluid swing is the best by far...
Nod