REHAB-HF: A Trial of Rehabilitation Therapy in Older Acute Heart Failure Patients, is a multicenter, randomized, attention-controlled, single-blind trial designed to examine the hypothesis that, in addition to standard care, a novel, tailored, progressive, multi-domain rehabilitation intervention administered to older patients with acute decompensated heart failure (ADHF) beginning early during hospitalization and continuing for 12 weeks will improve physical function and key clinical outcomes, including the rate of rehospitalization.