This lecture by the instructor covers the advancements in user digitization, focusing on practical and rich applications. Topics include activity recognition, pose sensing via mobile devices, new sensors for consumer devices, and future research directions. Challenges such as dataset curation, ill-posed inverse problems, and changing instrumentation points are discussed. The lecture also delves into projects like Ubicoustics, IMUPoser, and SAMOSA, showcasing the impact of passive health sensing and hyperactivity measurement in children.