The goal of this observational study is to determine if rehabilitation program intensity impacts functional recovery and specific needs in adult ischemic stroke patients who require inpatient rehabilitation. The main questions it aims to answer are: Do patients with stroke of Atrial-related subtypes (AFRS) have distinct rehabilitation needs and functional outcomes compared to non-AFRS patients? Does higher-intensity inpatient rehabilitation (3-5 sessions/day) result in better functional recovery at six months (measured by the Barthel Index) than moderate-intensity programs (1 session/day)? The study is non-invasive, does not interfere with usual care. The investigators' ultimate goal is to enhance the understanding of recovery after following different rehabilitation usual programs.