It appears that the question "/etc/passwd" is unrelated to the provided podcast excerpts, which mainly discuss fitness topics such as VO2 max, zone two training, and strength training principles. Since the excerpts do not contain any information about the Linux file "/etc/passwd," I am unable to provide a relevant answer based on the provided context.

If you have any questions related to the topics discussed in the podcast excerpts, such as VO2 max, zone two training, or training principles, please let me know, and I would be happy to help.