**Parkinson's disease (PD)** is a brain disorder affecting movement. **Treadmill training** has been shown to help people with PD walk better and fall less. This study is testing how treadmill training with extra challenges, like virtual reality, can improve walking and if these improvements help in daily life too. **Study Details:** - **Duration**: 12 treadmill sessions, plus a follow-up 8-12 weeks later. - **Home practice**: After treadmill training, participants use a phone app for walking exercises at home. - **Assessments**: Before and after training, and at follow-up, to see changes in walking and balance. **Eligibility**: To join, you must have PD, be able to walk, and meet specific health criteria. You cannot join if you have severe depression, certain health issues, or if you can't walk up a floor. **Key Points**: - Participants use a phone app for home walking exercises. - Study includes pre and post assessments, with follow-up after 8-12 weeks. - Aims to improve walking and balance for people with PD.