That is an interesting proposition. It reminds me of a time when I stood facing a blank wall and was punched again and again, never knowing where or when the next one would land. I was thinking about that incident just today, as it happens. Problem is, I wasn't a sub doing a scene with my lover. I was a kid being physically and emotionally abused by my brother, his command to remain in position enforced by a savage kick to my kidney or my testicles when I tried to move.
Incidents like that may be why I am a Dom today, I don't know.
But enough about me. How shall I go about training you? Let me think on that.