Participants in the conventional exercise group will undergo 24 sessions over 8 weeks (3 days per week, 30-minute sessions).

The program will include:

Stretching, strengthening, balance, gait, and posture exercises for the trunk and extremities.

Kyphosis prevention exercises, including pectoral stretching, back extensor strengthening, and trunk mobilization.

Resistance training using sandbags, dumbbells, and elastic bands. Tandem walking, weight-shifting on a balance board, and Frenkel coordination exercises.

Each exercise will be performed for 15 repetitions, while stretching exercises will follow a 20-second stretch and 20-second rest protocol. Progression will be customized based on the participant's condition.

Participants will be randomly assigned to either a conventional exercise group or a video-based game exercise group. All participants will receive conventional therapy for 8 weeks, 3 days per week, with 30-minute sessions (24 sessions in total). The video-based game exercise group will undergo the same conventional therapy, with an additional video game-based exercise program using the Becure Extremity ROM device under physiotherapist supervision. The program will include KinectPong, KinectBalloon, ArmRotate, and Uball games. Balance, joint position sense, ROM, functionality, and quality of life parameters will be assessed before and after treatment.

Participants in the conventional exercise group will receive a total of 24 sessions of conventional therapy over 8 weeks (3 days per week, 30-minute sessions).

The Becure Balance System will be used to assess participants' postural stability. During this measurement, the participant will be asked to place both feet on the Balance Board and maintain balance for 15 seconds. Throughout this period, the participant's sway movements will be recorded.

The Becure Extremity ROM device will be used to assess proprioception in participants at 30° and 60° shoulder flexion and abduction positions. Participants will first be asked to raise their shoulder to a specified angle, then replicate the same angle with their eyes closed. The angle values recorded with eyes open and closed will be compared, and the difference between the shoulder angles will be calculated.

joint range of motion (ROM) will be assessed using the Becure Extremity ROM system. This system utilizes built-in cameras and sensors to detect reference points during extremity movements, allowing for an objective measurement of joint ROM. In the Becure Extremity ROM assessment, the participant will stand in front of the camera and perform the required movement. Shoulder joint ROM, including flexion, extension, abduction, internal rotation, and external rotation, will be measured in degrees using this system.

Participants' upper extremity functionality will be assessed using the DASH (Disabilities of the Arm, Shoulder, and Hand) Questionnaire. DASH is designed to measure physical disability and symptoms in individuals with upper extremity disorders (hand, wrist, elbow, and shoulder). It is a 30-item scale that evaluates difficulties in performing various physical activities requiring upper extremity function.

Participants' quality of life will be assessed using the **Parkinson's Disease Questionnaire (PDQ-39)**. The **PDQ-39** is a self-administered tool that demonstrates optimal psychometric properties and reflects the full spectrum of quality of life in individuals with Parkinson's disease. The questionnaire consists of **39 items**.