Non-ergonomic postures and the resulting musculoskeletal disorders are key factors in worker disability and well-being. This underlines the importance of designing ergonomic work environments and educating workers in performing tasks ergonomically. We present Work-a-Pose to increase awareness of non-ergonomic postures and promote long-term sustainable work postures. To this end, we combine camera-based posture tracking with the automatic application of ergonomic guidelines. Glanceable visualizations highlight the worker's posture and potential ergonomic risks. A complementary, personal tool provides a more detailed overview of the worker's ergonomic score and motivates the worker to strive for a healthy work posture through simple gamification techniques.