When responding, make use of your hands. Showing your palm when explaining something indicates that you are being relaxed, honest, and confident. The interviewer will think that you know what you are talking about. If you want to emphasize something, you can do it with a clenched fist; but this is not an advisable gesture during an interview.
You can show interest and that you are listening attentively to your interviewer through head movements. Nodding is a reinforcement that you understood or agreed to what he or she said. Even though there are ideas that you would like to oppose to, nodding is still preferable rather than arguing. The latter might be the reason why you cannot get the job.
Gestures You Must Avoid
Avoid putting your hands into your pockets. This can emphasize your nervousness, or can give your interviewer that you may be hiding something from him, or you are uninterested to get the job. You can use hand movements when talking, however do not use them frequently. Excess movements can distract your interviewer from listening to your responses.
Another gesture you must avoid is frequent eye movement. Avoiding the interviewer's eyes will make him think that you are not listening or getting bored and uninterested. This may also give the impression that you are the type of person who is easily distracted, a weakness that could make you unqualified for the job.
Better Safe Than Sorry
Body language does not necessarily show what you intend to convey or really feel. But it is an advantage that you know the gestures you must use or avoid during a job interview to give a good impression for the words that you long to hear: “Congratulations. You are hired!”