Keep your shoulders back.
Keep your head erect.
Avoid folding your arms across your chest.
Avoid sitting or standing with arms or legs far apart or what could be described as an "open" position.
Use gestures that enhance your verbal message.
Nod your head affirmatively at appropriate times-but do not overdo it.
Project your voice loudly enough to be heard by the interviewer.
Articulate clearly-do not mumble.
Use pauses for emphasis.
Watch your pace-avoid talking too fast or too slow. Many people talk fast when they are nervous.
Know yourself and try to regulate your pace accordingly.