RecruitingBehavioural interventionEffects of an Independent Walking Program With Walking Poles in People With Parkinson DiseaseStudy Purpose: The purpose of the study is to compare changes in walking in people with Parkinson disease after an 8-week independent walking program with or without using walking poles. Major parts of the Study: Before the walking program: Measurements will be taken of you while you are walking. You will be given tests and questionnaires about your movement and thinking. You will be trained on how to use walking poles. Independent walking program: You will be asked to walk at least 3 times each week for 8 weeks and keep a log of your walking. If you are in the walking pole group, you will walk with the poles. After the walking program: Your walking, movement, and thinking measurements will be collected as before the walking program. Follow-up: The same measures of walking, movement, and thinking will be taken 3-months after ending the walking program.