No it's not a new App or device...it's what happens when you slouch over your smartphone. No only does it ruin our posture, it alters our mood.
Recent studies actually prove that being in an iHunch makes us less productive and lowers our self esteem. Fortunately, there are ways to fight it.
Keep your head up and shoulders back when looking at your phone, even if that means holding it at eye level. You might start to feel better ;)