Inclusion Criteria:  Age ≥18 years An established diagnosis of idiopathic PD of an early-to-moderate severity; that is from 0 to 2,5 according to Hoehn and Yahr (H&Y) stages Ability to understand, write and speak in Greek Written consent for participating into the study  Exclusion Criteria:  A diagnosis of a non-PD tremor disorder Moderate-to-severe PD (≥3 H&Y stages) due to a high falls risk Serious health or disability issues (either physical or mental) due of which exercise is not permitted and/or basic instructions during the program cannot be followed Mental disorder not related to PD Any disease other than PD which could affect mobility levels