Inclusion Criteria:  Adult subjects of both sexes, aged 65 and over, with social insurance; Residing in an ORPEA Group retirement home; Do not have a neurological, inner ear or visual disorder that is incompatible with climbing on the force platform or walking 10 metres round trip without human assistance; Can safely climb onto the platform by force (as estimated by the investigating practitioner) and can maintain an erect position for more than 1 minute, with eyes open or closed; Had an MMSE score of more than 18 on the nursing home entrance examination; Having a life expectancy of more than 6 months, as estimated by the coordinating doctor; Having signed the informed consent.  Non-inclusion Criteria:  Non-mobile resident: any person with a musculoskeletal or neurosensory disorder that does not allow them to stand for more than 1 minute on the power platform; History of limb amputation; Blindness, assessed using an Amsler grid; Refusal of the resident.  Exclusion Criteria:  Exit from the trial by resident's choice ; Inability of the resident to continue with static and dynamic assessments (e.g. due to a serious adverse event following a fall) The study is an intention-to-treat study and data from participants who do not complete the protocol will be used until the date of their exclusion from the trial or their death.