Greenfrog - i always started the exercise while symptom free. If I did not feel well, I would postpone the exercise. I was at a point in healing however, that the postponement did not last long.

I would sometimes feel symptoms by the time I was done with the exercise but not always. I would always rest after that however. Rest at that point for me did not mean laying down in a quiet room. I was beyond that. It meant doing something not incredibly tasking.

Hope that helps. Don't think about it too much. just do what works at any given moment. Feeling great? do your exercise. Feeling poorly, wait.