Ng chan wing chun

[k gledhill]

To go out of the body is a consequence of the big spread of the arms but to work with a 10 cm spread is the standard for anybody that allow to develop short strength

10 cm= 3.9 inch the width of what part of the arms ?
in the diagram as an example I downloaded from the interweb it has 188mm [or 18.8cm] = 7.4 inch as the width, not implying the correct width but is this the width implied ....10cm ? my forearm at the elbow is bigger than that.