 This study will have a pre- and post-implementation design. Baseline activity levels of eligible patients will be collected prospectively for approximately 3 months while staff is being trained and the details of the early mobilization program are being finalized. All eligible patients will wear an accelerometer while in the ICU. Length of ICU stay, total hospitalization, discharge disposition, and the occurrence of certain hospital-acquired complications will also be recorded as part of the baselinecurrent practice data. There will be a pause in data collection as the early mobilization program is incorporated into standard practice. 