Participants will be included in the primary study if they have all of the following criteria: a diagnosis of Alzheimer's disease; mild to moderate dementia (Clinical Dementia Rating Scale score of 0.5–2.0) independent mobility (walks outdoors with no more support han a single point stick) living in the community (ie not living in residential care) and (v) no other major neurological history (e.g. stroke with unilateral or bilateral paresis, multiple sclerosis) or orthopaedic history that impacts on functional mobility.