I've posted before (November 2014) about how smartphones are imperilling our posture - a phenomenon referred to as Text- (or Tech-) Neck.  New Zealand physiotherapist Steve August speaks of the iHunch and Harvard Business School Professor Amy Cuddy has coined the term iPosture to explain how small devices induce slouching.  In her new book, 'Presence: Bringing Your Boldest Self to Your Biggest Challenges', she draws on a number of research studies to show how this contracted, shrunken posture isn't just bad for our bodies but affects memory, mood and even behaviour.  "The smaller the device, the more you must contract your body to use it, and the more shrunken and inward your posture, the more submissive you are likely to become."  Phrased more positively - and this is where the Alexander Technique can help! - "Your physical posture sculpts your psychological posture, and could be the key to a happier mood and greater self-confidence." New York Times article: 'Your iPhone is Ruining Your Posture - and Your Mood'