I would be very skeptical of the idea that exercise can make your PN worse. The neurologists at Mayo Clinic in Rochester told my mother and I that increased activity will not make our conditions worse. And this goes against everything I have read. Exercise does a myriad of good things for the body, including influencing which genes get expressed. With exercise (and plant foods) the good genes are enhanced and the bad genes suppressed. Here is an article I found on the subject, but search for yourself and you will find many more:
http://healthland.time.com/2012/03/0...hange-your-dna

It is quite possible that you will have more pain temporarily after exercise, but in the long term I believe it is nothing but good.
Ron