During the Serious Game Design Summer School (2014) we designed a serious game which targets the text neck health issue. It's a well known problem from which all smartphone users suffer.
The game teaches the player to do correct exercises to release the tension in the neck, upper back and shoulders. We also added a nutrition guide for healthy items that are picked up during the game. And even more!

Our teams journal: http://group7.sgdss14.engagelearning.eu/
Gameplay trailer: https://www.youtube.com/watch?v=SrvElL8dFrQ&feature=youtu.be
More info on text neck: http://www.forbes.com/sites/nextavenue/2013/06/07/how-texting-can-give-you-a-permanent-pain-in-the-neck/