Inclusion Criteria:  Subjects will be included in the study if they have been diagnosed with idiopathic Parkinson's disease and are English speaking.  Exclusion Criteria:  Exclusion Criteria: 1) previous completion of LSVT BIG or other formal amplitude program training 2) non-idopathic Parkinsonism 3) any medical condition that would contraindicate exercise (ie. unstable cardiovascular disease) 4) cognitive impairment that limits ability to follow direction or demonstration