10 meters - from what to what??

[Russ]

Indeed it is an interesting conversation. ;)
You guys can get more precious information from an original source; a Free PDF file from USA shooting.org:
http://www.usashooting.org/downloads/us ... pistol.pdf
The first step of the process is how to convert a hobby shooter into a competitive athlete by providing timeless information of rules; how they will measure someone’s performance. :)
There is important information in the entire book to read, but not in only single page. :))
Guess what the second step is? ;)

Added value to my post!
Please pay attention at the light volume posted in the same page! It is extremely important to keep the same and appropriate light conditions during your practice time! This is $500.00 advice ;)

[Ricardo]

The board would provide a tactile reference point for the shooter's foot position and body angle. Also, depending on the height or thickness of the board it could provide some support, a point to push against for balance. At least, that's my speculation.