I’m really interested in this as well. I qualified for Boston 2021 (currently unclear if the race will be held)
This article was recently published and could be EXTREMELY useful. It talks about what effort to push (for a marathon) as it relates to critical running power.
I’m unsure if a power meter is needed to determine your critical power. I’m sure someone out there knows??
EDIT: Just did some reading. STRYD as some test out there that direct you to use their power meter. I’m wondering if you complete their test but use speed as a proxy to determine your Critical Power (in the form of running pace). This would seem to make sense as you are testing on flat ground and there should be a direct correlation between power and your running speed/pace.
Anyone tried this? Am I missing a reason as to why this wouldn’t work?