In communications training we know how important physical aspects of communication can be - especially positive body language. But how people use smartphones may point to a factor most people don't consider: your own negative body language doesn't just affect the person you're talking to - it affects you.
What psychologists term the "powerless position" - or what most laypeople would call "slouching" - may have a biological effect on the body, increasing the stress hormone cortisol and decreasing testosterone. "The good news," writes the author, "is that bad posture is fairly easy to correct - if you're thinking about it." Courtesy Quartz.