I've read a few articles on the internet about magnet placment according to the
polarity of the particular body part.
In the past, I have simply placed the negative pole of a magnet against the site
of pain and have had very good anecdotal success using that protocol.

It's my understand that one should never place a magnet on a body part which has
a positive polarity......the one exception being the back. What is the rational
behind placing a positive pole magnet on the back with a negative pole being
placed a few inches away? Also, why is this protocol not followed on the other
positive body parts?