Effective communication is very important in business relationships. You may not always be aware that your body is speaking a different language than your spoken words. Constantly looking at the time, crossing your arms, having a weak handshake are examples of things that could be sending a negative message to your clients and business partners.
Successful people are high in emotional intelligence. They are aware of the power that unspoken signals have in communication therefore they monitor their body language accordingly. Dr. Travis Bradberry from TalentSmart writes about body language blunders to avoid in order to be successful. Read this great article on Linkedin.