To improve your own body language, it's important to understand the body-language of others. Be 'tuned-in' so to speak.

For less than $10 you can get one of the (2) old-tyme books on the subject:

1. "How to Read a Person like a Book" : http://www.amazon.com/Read-Person-Like-Book-ebook/dp/product...

2. "I Can Read you like a Book" : http://www.amazon.com/Can-Read-You-Like-Book/dp/1564149412