This study is designed to better understand how patients with severe stroke move during their hospital stay. It will track their activity using a small wearable device (activPAL) along with standard mobility information already collected in clinical care. The goal is to learn what typical movement patterns look like early after a stroke and how well patients meet mobility goals while in the hospital. What is learned from this study may allow determination of how treatment for stroke patients may be improved to improve patient long-term mobility.