Hands and arms

Handshake
A good handshake is a firm one. If you are a young male, avoid the
primal urge to crush the hand bones of the interviewer. Remind
yourself that the purpose of handshaking is to establish rapport,
not to demonstrate how strong you are. Avoid also the limp
handshake, the long handshake (remember to let go) and the three
finger handshake.
If you suffer badly from sweaty palms, bring a handkerchief, but
if your sweat glands are running riot it would be a good idea to
warn the interviewer first before drenching their palm.