Many job seekers often do not notice or fail to notice the importance of body language in an interview.Here are some tips which you can make use of.
Don’t:
Chewing gum. Doing it looks nonprofessional.
Rub the back of your head or neck. This may reflect that you are not interested.
Play with your ears or nose which may indicate discomfort or lying.
Sit with your arms folded across your chest. You may look  unfriendly and disengaged.
Cross your legs and idly shake one over the other. It’s distracting and shows how uncomfortable you are.
Hold items in your lap. You might begin fiddling with them out of nervousness.
Lean your body towards the door.
Lean or rest your arms on the interviewer’s desk if you are in a personal office. This creates less personal space between you and your interviewer and could make them feel uncomfortable.
Slouch back in your seat. This will make you appear disinterested, unprepared, and/or unprofessional.
Stare back blankly. This is a look people naturally adapt when they are trying to distance themselves.
Hold eye contact for an uncomfortable amount of time.
Go overboard with gestures, as they might be distracting.
Do:
Sit up straight, and lean slightly forward in your chair. In addition to projecting interest and engagement in the interaction, aligning your body’s position to that of the interviewer’s which shows admiration and agreement.
Show your enthusiasm by keeping an interested expression. Nod and make positive gestures in moderation.
Establish a comfortable amount of personal space between you and the interviewer. Invading personal space (anything more than 20 inches) could make the interviewer feel uncomfortable and take the focus
away from your conversation.
Limit your application of colognes and perfumes. Invading aromas can arouse allergies. Being the candidate who gave the interviewer a headache isn’t going to work in your favor.If you have more than one person interviewing you at once, make sure you briefly address each person with your gaze and return your attention to the person who has asked you a question.
Interruptions can happen. If they do, refrain from staring at your interviewer(s) while they address their immediate business, and motion your willingness to leave if they need privacy.
After a few well-thought-out questions and answers with your interviewer,make sure your goodbye handshake is just as confident now as it was going in. Keep that going while you walk through the office building, into the elevator and onto the street.