CrossFit’s core methodology, what we call “the kernel,” has been explained in great detail in original articles such as “Foundations” and “What Is Fitness?” as well as the What Is CrossFit? section on crossfit.com. These writings should be reviewed periodically to keep us grounded in the core methodology. Unfortunately, even with these great resources, it is very easy to be lured away from the kernel by the constant barrage of new diets, new methods, and even the criticisms of CrossFit we are all exposed to on social-media channels. This noise makes us start to wonder if Olympic lifts are dangerous, if we should be kipping our pull-ups, if supplements are the most important part of nutrition, or if mixing training modalities blunts the adaptation we’re looking for.
It is important to take a step back at times and reflect on what is essential in CrossFit — what must be preserved at all costs. In a nutshell, to preserve the CrossFit methodology and avoid sinking to the level of so many other fitness programs, we must do the right things and do them well. To do CrossFit right means we incorporate the most effective movements and we train in all the necessary time domains. To do CrossFit well means we demonstrate technical prowess before we add intensity.
Do It Right

Theoretical Hierarchy of Development
CrossFit is a strength-and-conditioning program designed to optimize work capacity across as many diverse physical challenges as possible. This is how we define fitness. And we relentlessly pursue improved fitness, which is demonstrated as increased work capacity. Everything we do in CrossFit should be examined through this fitness filter. If something improves overall fitness or work capacity, it becomes part of the program. If it doesn’t, it gets dropped.
For example, nutrition is a foundational component of the CrossFit program precisely because of its tremendous impact on our ability to maximize our work capacity. Thousands of athletes have demonstrated that eating meat and vegetables, nuts and seeds, some fruit, little starch, and no sugar while keeping intake to levels that support exercise but not body fat is a dietary formula for elite levels of fitness. These two charges describe the nutrition part of the kernel. While discussions of various diets, supplements, pre- and post-workout nutrition, and meal timing are fun, focusing on these minor details without adhering to the basics represents moving away from CrossFit’s core message.