This was a Facebook comment that a few friends asked me to make permanently available as a blog post. Lightly edited but largely off-the-cuff; source is my own conversations with primary sources while investigating the history of parkour between 2006 and 2016 (ish).
Note: I am not a medical professional, and furthermore this essay does not apply to clinically-sufficient levels of anxiety, i.e. anxiety disorders. If you are experiencing life-disrupting levels of anxiety, please contact a medical professional.