The main objective is to assess the effect, compared to usual care, of a nursing accompaniment or nursing assistant intervention in the physical activity of patients hospitalized in the geriatric stay, on the daily number of steps. The secondary objectives consist in evaluating the effect, compared to usual care, of a nursing or nursing assistant's intervention in physical activity of elderly patients hospitalized on a short geriatric stay in terms of: * The change of the daily physical exertion in metabolic equivalent * The change of the daily number of steps * The change of care course * The change of in falls occurrence * The change of autonomy patient * The change of travels habits
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Change in the number of steps
Timeframe: this outcome is assessed at Day 5 after inclusion.