Study of an Physical Exercise Program on Older People of 75 Years Old and More, Hospitalized in Geriatric Short Stay

"Patients included in the control group will received the usual cares of the unit during their stay : support in the gestures of daily life and walking according to their ability and at the discretion of the care teams."

"Patients included in the intervention group will received the usual cares of the unit during their stay : support in the gestures of daily life and walking according to their ability and at the discretion of the care teams.~They will also get a physical activity program realized with a nurse or a nursing assistant, twice a day (morning and evening) for 5 days. The intervention consists of physical support with mimed instructions, the nature of which depends on the falling risk of the participant :~* High falling risk : out of bed exercise (on a chair for at least 30 min)~* Mild falling risk : out of bed exercise + in front of chair (The participant stands standing in static equilibrium to a chair holding the back of it for 2 minutes, on both feet or one foot)~* Low falling risk : out of bed exercise + in front of chair + FTSS exercise (The participant performs a transfer activity of sitting to standing repeated 5 times, with physical assistance or not)"