Inclusion Criteria:  Capacity to consent; Hoen and Yahr scale: 1-2 stage; Functional Ambulation Category (FAC) ≥ 2; Ranking scale score ≤ 3; Stability of drug treatment for at least 1 month; Geriatric Depression Scale 4-items ≤ 1; Mini Mental State Examination ≥ 24; Maintaining an upright posture ≥ 30''.  Exclusion Criteria:  History of syncopal episodes, epilepsy and vertigo not controlled pharmacologically; Serious dysfunction of the autonomic system; Severe behavioral syndromes not compensated by drugs; Concurrent neurological and/or cardiac diseases; Recent femur fracture Chronic medium to severe pain affecting standing or walking.