Diaphragmatic breathing exercises: First Evaluation + (1 week break) + Motor imagery protocol + Second Evaluation + 8 weeks of diaphragmatic breathing exercises +Third Evaluation +(1 week interval) + Motor imagery protocol + Fourth Evaluation

First Evaluation + (1 week break) + Motor imagery protocol + Second Evaluation + 8 weeks break +Third Evaluation +(1 week interval) + Motor imagery protocol + Fourth Evaluation

Diaphragmatic Breathing Exercises

1-Isometric Elbow Flexion Force: The participant will try to move their hands towards their shoulder as forcefully as possible for 2-3 seconds with their upper arms at their sides, elbow bent at 90 degrees and forearm in supination.

2-Handgrip strength: Handgrip strength will be assessed using a Jamar hand dynamometer (Lafayette Instrument Company, USA).

3-Upper extremity reaction test: It is planned to use a validated BlazePod sensor for upper extremity reaction time test

4-Finger reaction test: By placing the dominant hand index finger on the left button of a computer mouse, the participant will be asked to press the left button as soon as the traffic light pattern glows green on the screen.

5-Hand performance test: A nine-hole peg test will be used.

6-Position Sense: The height of the laser track marker test target board can be adjusted according to the height of the person, and the zero point will be aligned for each patient's glenohumeral joint separately. A standardized coordinate system drawn on the target board will show the different angles of motion calculated using a formula.

VAS: In our study, mental fatigue level will be evaluated with VAS. VAS is a valid and reliable method for measuring the severity of fatigue and is a one-dimensional scale widely used in the clinic. In practice, patients are asked to choose the number that best describes the severity of fatigue they feel. Zero means not tired, 10 means very tired.