Combining Nutrition Supplementation With an Exercise Program in Elderly Malnourished Frail Patients After Hospital Stay

Inclusion Criteria: * Age ≥ 65 * Malnutrition: Nutrition Risk Screening ≥3 * Frail/pre-frail status according Fried Frailty Phenotype: 1-2 criteria present = pre frail, \> 2 criteria present = frail * Frailty status according to SPPB: A: 0-3 points = disabled, B (B+): 4-6 points = frail (at risk of falls), C (C+): 7-10 points = pre-frail (at risk of falls), D: 10-12 points = robust. * Ability to sit * Consent to participate in the study * Ability to follow the instructions of the vivifrail program * Prescription for use of an ONS Exclusion Criteria: * Severe acute cardiovascular issues: eg. unstable angina pectoris, uncontrolled arrhythmia, uncontrolled arterial hypertension or unstable cardiovascular disease or other unstable medical condition. * Persisting oedema and/or ascites * Contraindication for the protein-rich ONS (e.g. cow's milk allergy, end stage renal disease without renal replacement therapy) or dysphagia for liquids * non-removable plasters or bandages at feet or hands aggravating body impedance analysis (BIA), implanted defibrillation device * Parenteral/tube feeding * No access to telephone or severe hearing loss * Terminal illness * Hospitalized due to pulmonary thromboembolism * Considerable cognitive impairment: Mini-mental score \< 18 or advice of healthcare professionals against inclusion due to cognitive or psychological reasons.