Parkinson's disease is the most common progressive neurodegenerative movement disorder. Common movement impairments in Parkinson's include balance and walking difficulties. These impairments lead to falls, increased levels of functional dependency, and a decrease in quality of life. Exercise in Parkinson's patients improves their functional symptoms in daily life, enhancing both motor and non-motor skills, and consequently increases their quality of life. Recently, various additional methods have been developed to increase the effectiveness of exercise in Parkinson's rehabilitation and to contribute to motor skills. Focus of attention instructions are fundamental concepts in motor function learning. External focus of attention has been shown to facilitate motor function development, reduce postural instability, and improve dual-task walking by being easier to remember. In Parkinson's patients who experience freezing phenomena, internal focus of attention instructions enhance walking stability and movement control, thereby reducing the risk of falls. However, there are no studies on the combined focus of attention instructions in Parkinson's patients. This study is designed as a randomized controlled, single-blind, prospective trial to examine the effects of a combination of internal and external focus of attention instructions on walking, balance parameters, quality of life, and patient satisfaction levels, taking into account the presence of freezing phenomena in Parkinson's patients.