The way people walk is mentioned in Neil Strauss' book as well as the Mystery Method. Although having read their stuff, I still struggle to believe half the stuff they pump. But never mind that, posture and energy are 2 massive things when you walk into a pub /club / bar. Not a macho strutt like half the douchers do, where I'm from, but a confident stride, good smile, upright posture. If you go to the gym as well upright posture means your pec's are shown off to a greater extent rather than just having slouchy moob's!