Inclusion criteria | Exclusion criteria |
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• age ≥ 70 years • Clinical Frailty Scale score 4 (“very mild frailty”), 5 (“mildly frail”), or 6 (“moderately frail”) • living at home or assisted living • able to walk ≥10 m with or without walking aid | • able to walk ≥800 m without walking aid or breaks • cognitive impairment (Short Orientation-Memory-Concentration Test score > 10) • insufficient German language skills • visual acuity not sufficient to recognize study material • medical conditions: - heart failure (NYHA III-IV) - stroke within the last 6 months - Morbus Parkinson (Hoehn & Yahr Stage ≥3) - cancer, if currently under treatment (e.g., chemotherapy, radiation) or in an advanced stage - severe lung disease requiring (intermittent) oxygen supply - multiple sclerosis |