RecruitingBehavioural interventionPhysical Rehabilitation for Older Patients With Acute Heart Failure With Preserved Ejection FractionThe REHAB-HFpEF trial will determine whether a novel physical rehabilitation intervention will improve the primary outcome of combined all-cause rehospitalizations and mortality and the secondary outcome of major mobility disability during 6-month follow-up in patients hospitalized for heart failure and preserved ejection fraction (HFpEF), which is nearly unique to older persons, and for which there are few treatment options.