No wet fish of vice grip handshakes please. When shown your seat, sit with a straight back, looking alert and interested. Folded arms, hands in front of the face, head propped up on you hand all give inappropriate messages. Try not to fiddle with pencils, ear lobes, chins or locks of hair. No finger drumming or brushing imaginary specks from jacket or trousers.
Eye contact is critical.
As a rule of thumb, try to maintain eye contact for about two-thirds of any interaction with someone. We all know how difficult it is to assess someone who rarely looks at us. We share the same discomfort at being eyeballed almost constantly by someone who is talking with us. Where you are being interviewed by a panel of three or more people, remember to include everyone. Keep your body posture square to the whole panel and scan the whole panel with your eyes.