Looking for specific feedback on how you stand and sit? Try PostureScreen Mobile, an app for Android and iOS devices that takes a close look at your carriage. To use it, take front- and side-view photos of yourself with your phone and submit them. The app analyzes the position of your head, rib cage, and pelvis with spine-modeling software used by orthopedists, showing you where you're off-kilter. For an additional fee, you can get videos of exercises and advice on how to correct your posture.