I notice it's hard to get things done in a meeting when your arms are crossed over your chest or abdomen. It's the universal sign of "I disagree with you and I'm on the defensive" Try this: cross your arms, and the person across from you will inevitably do so as well. I find that when they do that, it's much harder to convince them of your point of view. It's almost as if their defensive posture puts their mind into defensive mode. The opposite seems to hold true as well: relax your posture (open arms) and the person will be more receptive.