Body language is very important for any executive. Besides the way he dresses and how he communicates orally and in writing, it is the way an executive carries himself that creates a positive impression with the people he interacts with. There are any number of books on the subject. Most of them talk of what each gesture and posture communicates or even what not to do when you are trying to communicate something but rarely does it talk in detail of what to do. Bharata Muni's Natya Sasthra is a thousands year old Sanskrit book that talks of body language in Theatre. This book talks about how Bharata Muni's theories can be implemented in ordinary life of an executive too.