Generally a well balanced nervous system, free of interference (see neuraltherapy approach), prepare the body to ARP treatment.
Any kind of problem can generate a disturb into the body/CNS, this can limit the results with the ARP, and in my opinion with any kind of therapy.
My experience with interference go from scar tissue to classic chiro subluxation.
A my basic approach is toward balancing Cranium, Spinal Column, Pelvis/Viscera.
Some peoples have specific and hard to find interference, but when you find and correct it, ARP treatment become extremely powerfull.
An interference is a field of disturb that cause a neurologic disorganization.
A simple example, can be the level of hydratation, of low level of sugar into the blood.
Athletic performance and general CNS function can be lowerd by this little understood condition.