The first thing the waterfall removes is your narrative.
You can walk to the base of it holding any story you like about your readiness. The moment the water hits, the story is gone, and what remains is whatever you have actually trained. I keep going back because I need that check — it's easy, in my line of work, to mistake talking about something for being able to do it.
Understanding is what you have. Change is what survives contact.
I'm a student in this practice, not a teacher of it. But there is one small thing from it that transfers almost anywhere:
The borrowed practice
Once a day, do one thing slightly before you feel ready. Send the email before the third re-read. Start the task before the coffee. Speak in the meeting before the perfect phrasing arrives.
The size doesn't matter; the timing does. You're training the same gap the cold water trains — the space between the impulse to wait and the act of moving — and that gap turns out to be where most stuck-ness lives.
Your nervous system doesn't read your journal. It reads your reps.