Prior to the intervention, the Upper Extremity Closed Kinetic Chain Stability Test will be administered to determine participants' upper extremity balance levels. Participants in the group will watch video recordings of the Upper Extremity Closed Kinetic Chain Stability Test, performed by a third person, from various angles, at both normal and slow motion speeds, for a total duration of 10 minutes. Following the intervention, the Upper Extremity Closed Kinetic Chain Stability Test will be performed in four repetitions, identical to the pre-intervention assessment. In order to prevent fatigue from influencing the outcomes, participants will be given a 5-minute rest period between the pre- and post-intervention assessments. The Moxy device will continuously monitor throughout all procedures. The fatigue levels of the participants will be evaluated prior to and following the test.

Prior to the intervention, the Upper Extremity Closed Kinetic Chain Stability Test will be administered to determine participants' upper extremity balance levels. Participants in this group will be asked to imagine themselves performing the Upper Extremity Closed Kinetic Chain Stability Test while watching video recordings of the test, captured from different angles and executed by a third person, for a total duration of 10 minutes at both normal and slow-motion speeds. Following the intervention, the Upper Extremity Closed Kinetic Chain Stability Test will be performed in four repetitions, identical to the pre-intervention assessment. In order to prevent fatigue from influencing the outcomes, participants will be given a 5-minute rest period between the pre- and post-intervention assessments. The Moxy device will continuously monitor throughout all procedures. The fatigue levels of the participants will be evaluated prior to and following the test.

This study, in contrast to prior research, will examine both the acute effects of action observation therapy and its impacts at the peripheral level.

In this test, participants assume a push-up position, positioned between two parallel strips placed on the floor, and touch the opposite strips in a cross-body manner with their hands for 15 seconds. The total number of touches is recorded as the score. The test is performed four times, with a 45-second rest interval between each trial. The participant's test score is calculated as the average of the scores from the last three trials.

In this test, participants assume a push-up position, positioned between two parallel strips placed on the floor, and touch the opposite strips in a cross-body manner with their hands for 15 seconds. The total number of touches is recorded as the score. The test is performed four times, with a 45-second rest interval between each trial. The participant's test score is calculated as the average of the scores from the last three trials.

In this study, the Moxy Monitor device will be used to assess the upper extremity muscle oxygenation levels of the participants. This device operates using near-infrared spectroscopy (NIRS) technology and non-invasively measures the amounts of oxygenated and deoxygenated hemoglobin in muscle tissue. The validity and reliability of the Moxy Monitor device in physiological measurements have been reported in numerous studies. Measurements will be conducted by placing the sensor on the anterior portion of the deltoid muscle on the participants' dominant side.