A Business Insider article gives tips for body language, and some suggestions are better than others.
The best advice is to "sit up straight" and "walk in with your shoulders pulled back and head held high"―good for an interview and for posture. The given example is for when you approach a receptionist, and this is a good first test of your communication skills and how you treat people throughout the interview process. Also good advice is to "nix sweaty palms with cold water" at a restroom before the interview starts.
Other advice is questionable. The point of "hold still" and "don't cross your legs" is to avoid excessive fidgeting, but a natural, comfortable position is probably best. In an hour-long interview, you can certainly shift your body a bit, which may include uncrossing and re-crossing your legs a couple of times. You don't want to appear stiff; authenticity is best.
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