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The CrossFit stimulus—constantly varied high-intensity functional movement coupled with meat and vegetables, nuts and seeds, some fruit, little starch, and no sugar—prepares you for the demands of a healthy, functional, independent life and provides a hedge against chronic disease and incapacity. This stimulus is elegant in the mathematical sense of being marked by simplicity and efficacy. The proven elements of this broad, general, and inclusive fitness, in terms of both movement and nutrition, are what we term our CrossFit Essentials.

"Trainers … apply exercises to their clients in order to induce adaptations in structure and function that lead to improved fitness. In order to do this effectively, reliably and safely, the working trainer must understand the structures they are stressing with exercise to produce the functional change that is fitness. This is the primary reason we learn anatomy and physiology."

Read the article Anatomy and Physiology Primer for CrossFit Trainers

CrossFit trainers are skilled in the art of making many difficult movements accessible for the beginner. A good trainer will guide new athletes through a progression, celebrating the small victories along the way. A great trainer will understand this process is not just for the beginner and continue this system with intermediate and advanced athletes.

WatchHandstand Push-Up Variations

Applying resistance training to a CrossFit Kids program should be done with the same considerations as with adults: minimize risk and develop adaptations; however, considering the developmental process and length of the available timeframe to see results in this younger age group, perhaps the tension between technique and intensity (speed and load) should lean in favor of technique.

Read the article CrossFit Kids Research Brief: Kids and Resistance Training

The CrossFit program aims to develop a fitness that is broad, general, and inclusive. To truly pursue and attain this degree of fitness, athletes of all developmental levels should continually strive to learn and master new and more challenging skills.

Read MoreSkill Development Forever

The CrossFit program is designed for breadth, generality, and inclusivity. Variance follows as a critical element to achieve this aim. It is not enough to develop one capacity at the expense of any or all others. To truly achieve a state of general physical preparation, elements such as repetitions, distances, loads, movements, and durations of effort must be varied and varied regularly.

Read MoreDefining CrossFit, Part 3: Variance

In parts 1-4 of the “Power of Progression” series, we covered standard progressions used in CrossFit certificate courses to teach complex movements like the push press and push jerk, sumo deadlift high pull, med-ball clean, and snatch. These are a few examples of progressions, and while we have found these particular examples effective, they are not the only possible progressions for these movements. There are also many other movements for which a progression may be an appropriate teaching tool. Thinking about and attempting to create your own progressions is a great way to develop a better understanding of a given movement while also providing your athletes with new learning tools.

Read MoreThe Power Of Progression, Part 5: Building Progressions

To run group classes without compromising our hallmark laser focus and commitment to the athlete, the trainer has to learn to give each member of the group the impression that he is getting all the attention he could get in one-on-one training, and that requires tremendous training skill. … All the demands on the trainer skyrocket in this situation, however. Attention, enthusiasm, voice projection, and engagement all have to escalate. It is an acquired skill — an art, really.

Read the article Scaling Professional Training

The fitness that CrossFitters demonstrate cannot be found without ring training. Gymnastics rings occupy a place in our training that only the barbell can match. Kettlebells and dumbbells, medicine balls and stretch bands, while essential to our practice, are second-tier tools to the rings.

Read the article Ring Strength

All our athletes begin squatting with the “air squat,” that is, without any weight other than body weight. As a matter of terminology, when we refer to the “squat,” we are talking about an unladen, bodyweight-only squat. When we wish to refer to a weighted squat, we use the specific terms “front squat,” “back squat,” or “overhead squat.” Training any of these weighted squats before mastering the weightless variant compromises both the safety and efficacy of the training process and the athlete’s potential.

Read the article Squat Clinic

Safely scaling workouts for a wide range of athletes without sacrificing attention to non-scaled athletes — it’s an essential CrossFit coaching skill. Effective scaling at an affiliate demands an understanding of CrossFit programming theory, awareness of your athletes’ capabilities and limitations, and quick application of many possible scaling methods. It’s also important to understand why we scale CrossFit workouts: CrossFit workouts are scaled to preserve the intended stimuli despite athlete limitations such as experience, injury, illness or range of motion.

Read the articleScaling CrossFit Workouts

CrossFit defines core strength as midline stabilization. Capacity with midline stabilization translates to improved efficiency and performance as well as greater power output. We use the GHD for four exercises that heighten awareness and develop this capacity: the hip extension, back extension, hip-and-back extension, and the GHD sit-up.

Read MoreTraining the GHD Sit-Up

There is a tendency among new CrossFit athletes and trainers to avoid heavy days entirely or execute them incorrectly. However, CrossFit is a strength and conditioning program. While people sometimes characterize CrossFit by its programming of mixed-modal workouts for time (“met-cons”), this is a limited view. Days devoted to strength training are essential to CrossFit and are integral to CrossFit’s prescription of constantly varied workouts. Heavy days are important for everyone: the young, old, fit, and unfit. Excluding anyone from this work will blunt important adaptations.

Read MoreHeavy Days

“Exercise training programs may prove to be simple, yet important, methods of enhancing aspects of children’s mental functioning that are essential to cognitive and social development.” Therefore, programming short bouts of relatively high-intensity physical activity can be an efficient way to increase not only fitness but also brain function in a scholastic environment or in a box as part of a CrossFit Kids program.

Read the articleCrossFit Kids Research Brief: Intensity and Cognition

“Strive to blur distinctions between ‘cardio’ and strength training. Nature has no regard for this distinction.” But how does CrossFit blur this distinction given that strength/power training and cardiovascular training are at different ends of the power spectrum? More simply put, when you do “Grace” or “Fran” or “Angie” or even “Linda,” what kind of training are you doing? Is it power, strength, or cardio? Can they be combined? To what extent do they overlap? Obviously, they in fact do, and this is one of CrossFit’s huge contributions to fitness, but it flies in the face of much of the accepted knowledge in exercise science. How does it work? What are the mechanisms? These are complex questions and the answers depend on many factors.

Read the article Human Power Output and CrossFit Metcon Workouts

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