and hitting ur head falling off a board would be something to do just that....there r safer ways to exercise
and not run
the risk
of triggering
the symptoms.
Walking, using a recumbent bike, swimming......
U could keep on doing what u r doing...it may put u at risk, but just having chiari as a dx is not enuff u may need more testing b4 u decide what type of exercises u want to do or not....some can continue with no issues,
May I ask what the unrelated issue was that they found the chiari.