Various implementations disclosed herein include devices, systems, and methods for detecting and correcting the posture of users of electronic devices. In some implementations, an image capture device or other sensor is used to estimate or otherwise determine a posture of a user. As a specific example, a head mounted device (HMD) may include a camera that captures an image of the user wearing the device and the image may be analyzed to identify 3D joint locations representing the current posture of the user relative to the HMD. The user's posture is analyzed to assess whether a posture correction or change is desirable, for example, by classifying the posture as good or bad or by scoring the posture on a numerical scale. If a posture correction or change is desirable, appropriate feedback to encourage the user to adopt the posture correction or otherwise change his or her posture is identified and provided.