The right body language and tone of voice are very crucial to a successful lesson.  Do you believe this?  How have you been affected by either or both as student yourself? Have you observed your colleagues in their classes and watched how their tones and body languages have made their lessons successful or otherwise?
 http://www.youtube.com/watch?v=4PwGPTFrhmk
  Lets listen to experts in this field and see what they have to say on the effect of body language:

http://www.youtube.com/watch?list=PLE58ECDD977FC905B&v=AsvDOU7kkTA

 http://www.pamross.ca/effective-communication-tone-body-language-and-brevity/



Looking forward to hearing to your views on this.