when you looking down to play you smartphone. “Did you know that the human head weighs eight pounds?” is not only a memorable line from the movie Jerry Maguire but is also a factor in a health epidemic. Take a moment to notice your posture. Is your neck tilted down? The posture we use when we are on our phones can lead to “head pain, neck pain, arm pain and numbness,” according to Sammy Margo, from the UK’s Chartered Society of Physiotherapy, who also thinks “text neck” is on the rise.