Older adults hospitalized for acute medical problems are at risk of significant functional and mobility decline from restricted physical activity (e.g., extensive bed rest) during hospitalization. Many do not return to their pre-hospitalization level leading to an increase in the length of hospital stay (LOS), hospital readmission rates, and the need for post-discharge institutionalized care. The elder people’s basic mobility analysis with artificial intelligence (MobilityAI) project is a wearable sensor technology-based mobility assessment solution to in-hospital older adults. With a body attached accelerometer, the AI model recognizes activities such as sitting, standing, sleeping, stand up and go, and 10-meter walk. The project is currently in its first stage.