For better or worse, interviewing etiquette is an essential aspect of getting the job. Learn all about it here.
Body language can communicate almost as much information as what you are actually saying. Your true thoughts and attitude can be reflected in your body language. The more positive you feel about the interview and your abilities, the more likely this will be reflected in your body language.
Take a look at some examples of how body language can communicate thoughts and feelings.
Try video recording yourself during a practice interview to observe your body language. You can also practice with a friend or use a web conferencing tool like Skype which allows you to see a mirror view of yourself while you are talking to another person. Pay attention to any unflattering mannerisms you may exhibit, like biting your lip, scowling while thinking, or nervous tapping.
While it is good to be aware of any body language concerns, the best way to portray good body language is to approach the interview with a positive attitude. When you feel positive, you will naturally relax and smile more, thus making you appear more confident and appealing.