Physical Rehabilitation of Older Persons Following a Community-Acquired Infection Hospitalization - A Randomised-Controlled Trial

Inclusion Criteria: * Patients aged ≥65 years or 18-64 years if the presence of at least one chronic disease (e.g., diabetes, COPD, heart failure, etc.) * Suspicious of a lower respiratory tract infection AND * Presence of one or more symptoms of a lower respiratory tract infection such as fever ≥38.3°C, hypothermia \<35.0°C, new onset of cough, pleuritic chest pain, dyspnea, or altered breath sounds on auscultation. * Positive urine nitrate test and/or leukocyturia as depicted by positive esterase test or microscopy AND * Presence of one or more symptoms of urinary tract infection such as dysuria, urgent or frequent urination, perineal or suprapubic pain, costo-vertebral tenderness or flank pain, fever (ear or rectal temperature of ≥38.2°C or axillary temperature of ≥38.0°C), or history of feeling feverish with shivering or rigors in the past 24 hours. * Functionally independent before hospitalization and expected to be discharged to their own homes. * Signed informed consent. Exclusion Criteria: * Hospitalization within the past 14 days. * Inability to participate in the study due to dementia, paralysis, or other disorders. * Severe aortic valve stenosis or terminal illness. * Unstable cardiac arrhythmic disease. * High risk for non-adherence as determined by screening evaluation. * Already participating in regular exercise training. * Unable to understand Danish. * Unwilling or unable to give informed consent.