This study aims to help people with Parkinson's disease (a brain disorder causing movement problems) improve their walking and balance. It tests whether a gentle brain stimulation called transcranial direct current stimulation (tDCS) helps when combined with Nordic Walking (NW) (walking with poles) compared to NW alone. Participants will be randomly selected to receive either real tDCS or a fake (sham) version that doesn't actually work. Everyone will do the walking program and have sessions three times a week for four weeks.

• Study lasts for 4 weeks, with 3 sessions per week.
• Participants must be adults with stable Parkinson's disease medication.
• Possible mild tingling or itching from the stimulation.

Participants will have their walking speed measured and check for any side effects. This clinical trial is conducted at a university in Brazil. Only those who can walk at least 10 meters and follow simple commands will be included. The study ensures safety by checking vital signs like heart rate and blood pressure during sessions.