There have been no studies of fear related to physical activity (PA) or kinesiophobia (KP) in adolescents with cardiac arrhythmia disorders (CArD). As such, there are no validated or reliable tools to measure KP in adolescents with CArD. The purpose of this pilot study is to develop and determine the validity and reliability of a modified version of the TSK-Heart for adolescents with CArD (TSK-Heart-A). The study will have three discrete phases: Phase I = content validity, recruiting content area experts to review the survey; Phase II = face validity, recruiting adolescents with CArD to provide comments on the survey; Phase III = construct/criterion validity and internal and test-retest reliability recruiting adolescents with CArD to complete the new survey as well as other surveys on mental health, quality of life, and physical activity.