Hey Ken, one of my own spectacular bike crashes came while zooming down a hill after a long day of tennis. The racket in hand one second and the next, splat! somewhere on the road.
Does the octave, tone, pitch of that negative voice belong to any person of your past? My own inner negative voice belonged to (sounded like) a specific person and I figuratively needed to 'go after' and challenge those ridiculous negative statements until they no longer held sway. I like your method.
More power to you, Ken. Yours is an admirable and worthwhile undertaking.