If English isn't your first language, it must be a very, very, very close second -- what you say is a pleasure to read, as is the way in which you say it. I hope you keep on posting.
I think we are all hitting on a point that helps define the art of training, learning, life generally -- the often fine line between experiencing something fully and destroying the experience (or even ourselves). We can encounter that so many ways -- pushing a set of 100s in the pool, rock climbing at our limit, playing a piece of music at a fast tempo, loading up our work and social schedules, you name it. If we stay out of the equally sad camps of those who never approach the line, and those who perpetually overstep it, we end up with a pretty good set of abilities, skills, and experiences, and many days we'd love to live over again.