as far as the exercize goes, of course if you are able to exercize doing so will benefit you in many ways, pulmonary, cardiac, circulation etc. That being said, many posters on here over the years have been runners, cyclists, body builders, mountain climbers, skiiers etc. and the exercize that they did did not prevent them from getting PN. Will it help to stop or even reverse the damage being done by pn, probably for some, maybe for others and not for the rest. Is exercize a treatment for PN?, i dont buy it.