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19 Feb

I’m writing this blog to give a 2nd opinion and to combat the marketing hype that surrounds crossfit.I wouldn’t take much offense to crossfit and would let it do its own thing, except when you start telling people that this is the way of the future and that Ryan Hall would run faster if he did this stuff , then I have a problem (Yes, CFE founder has made this claim)For this post, we’ll focus on Crossfit Endurance because it got some major publication in this month’s Runner’s World and has been getting some hype lately.Crossfit exploits a couple different natural reactions people have to get people on their bandwagon. They throw in some pseudoscience or misinterpretation of science and they’ve bolstered their selling point.

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While I’ve written before about the measurement of VO2max and how it relates to performance and you can read more in depth on it in those blog posts, it bears repeating the conclusions reached by Vollaard et al (2009):“Moreover, we demonstrate that VO2max and aerobic performance associate with distinct and separate physiological and biochemical endpoints, suggesting that proposed models for the determinants of endurance performance may need to be revisited (pg. The basic idea is that VO2max and performance are separate things.

If you were at my presentation at the American Distance Summit in North Carolina, you got to hear me take a few jabs at crossfit (and Renato Canova even threw in a jab or two! Since it’s a question I get asked a lot, lets take a look at crossfit endurance.

Crossfit Endurance and CF in general is a randomized non-system of training.

When this program was researched, they noted that VO2max increased by a large amount and that certain aerobic enzymes also increased.

Using this and similar studies as their basis, CF has championed the idea that you can get the same, or better, performance off of doing intense work like that done in the study.