You all missed the real reason. Holding the hands behind the back allows walking and standing with a slight hunch forward. This relieves the nerve compression of sciatica, a common ailment of older people, especially men. It is possible that many who do this don't even fully recognize why they do it, but just that it makes them feel better.
FLASH Application. Online Application for an Insurance License. The California Department of Insurance (CDI) requires California resident applicants to first pass the qualifying license examination prior to submitting their license application.
A CSI receives super-speed after being hit by lighting at the same time as a science disaster and he turns himself into a superhero. See also: Arrow, Legends of Tomorrow, & Supergirl. The Flash was filmed in Vancouver, BC & Britannia Beach, BC in Canada. Zoom to: Britannia Beach, BC, Vancouver, BC.