In the study, there will be no participant groups; YouTube videos searched using the keyword "balance exercise" will be evaluated based on specific criteria.

The DISCERN tool is a standardized questionnaire developed to enable researchers to systematically evaluate the quality of health information related to treatment options. The instrument comprises 15 specific items followed by an overall assessment question aimed at rating the general quality of the information provided

The overall quality of each video was evaluated using the 5-point Global Quality Scale (GQS), a widely used instrument for assessing the comprehensiveness and clarity of health information. According to the rating criteria, videos receiving a score of 1 or 2 were classified as low quality, a score of 3 as moderate quality, and scores of 4 or 5 as indicative of high quality.

Video popularity was quantitatively assessed using two validated metrics: the Video Power Index (VPI), calculated as the ratio of likes to the total number of likes and dislikes multiplied by 100 (likes/(likes+dislikes))×100 and the View Ratio (VR), defined as the number of views divided by the number of days since the video was uploaded (views/day)