Thanks Sifu Terry, that clears up a lot.
One other question (posted above): the DVDS say to avoid practicing within half an hour of having eaten food. Is this just because digestion would interfere with the FPCK energies? If one were pressed for time and had just eaten would it be fine to do the practice anyway?
I guess my question is: is practicing soon after having eaten detrimental, or just less-than-ideal?