Typically I will say something such as, “ I want you to extend your hand and then to pull it away and at the same time but not before after that I want you to just let it float up into the air and just continue to hold it there… and really just continue to hold it there.” Most of the time without much fuss full rigidity of the arm can be attained. I’ve found though that through the years the better you get at attaining arm catalepsy with clients the better you get at handshake interrupts because they are pretty much the same thing. A good handshake can give a person a great deal of information about how much rapport they have with a client. Do they squeeze your hand do they let go, do they thrust forward or pull back. Typically when working with clients I’m looking for an ambiguity of movement when shaking their hand.