Body language affects what people think of you, and also what you think of yourselves.
But why not trying to understand better how to benefit from our own body language? If it can help us to feel more secure, comfortable and stronger in social environments, it is surely worth a small space in some areas of the brain where we store useful information.
I was fascinated by this topic several discontinued times so far (reading books, quitting the topic, then again reading papers etc…), but this Ted Talks is worth the twenty minutes it lasts as a nice introduction to the topic. True, the content is not rocket science, and also generally true, the first impression might be misleading. But take it as a easy kick-start if you want to get more into the topic.
If you want to know more:
Who is Amy Cuddy?