Build the exact sequence of cues, breaths, and timings before each shot. Add, reorder, and edit ordered steps with seconds. Run them as an in-page player with a large step name and per-step countdown, or export a single-sheet monochrome printable card to tape to the bench. Nothing is stored on this site. The routine lives in the page until the tab closes, and the PDF is generated, streamed, and forgotten.
A pre-shot routine moves the loading sequence under procedural control so working memory is free to call the shot. The value of the routine is the repetition until the sequence is automatic. The card and the player do nothing magical. The repetition is the work.