Security ... think about it!
A recent survey of people who had committed violent crimes revealed that a majority of them targeted their victims because of the way they portrayed themselves. Each one of them said that body language was the main reason that these victims were targeted. A slumped posture and a lack of awareness of what was around them were the two triggers that decided whether an attack could potentially be successful. If on the other hand the potential victim was alert, self assured and looked as though they would be willing to fight back then there was a good chance that they would be left to go on their way unchallenged.