What Is Crossfit

CrossFit is many things. Primarily, it’s a fitness regimen developed by Coach Greg Glassman over several decades. He was the first to define fitness as “increased work capacity across broad time and modal domains” giving fitness a more meaningful and measurable definition.


CrossFit itself is defined as that which optimizes fitness “constantly varied functional movements performed at relatively high intensity”. 


It is also the community that spontaneously arises when people do these workouts together. In fact, the communal aspect is a key component of why it’s so effective. 

The Theory

CrossFit is an evidence-based fitness program with a focus on safety, efficacy and efficiency (the three most important and interdependent facets of any fitness program). Its programming and results are supported by measurable, observable, and repeatable data. 


The CrossFit methodology depends on full disclosure of methods, results and criticisms, and has employed the Internet as its primary means to support these values. Its charter is open source, making co-developers out of participating coaches, athletes and trainers through a spontaneous and collaborative online community. It is empirically driven, clinically tested and community developed.


CrossFit offers the world's most useful definition of fitness: “increased work capacity across broad time and modal domains”. Capacity is the ability to do real work, which is measurable using the basic terms of physics (force, distance and time). Life is unpredictable (much more so than sport) so real world fitness must be broad and not specialized, both in terms of duration and type of effort (time and modal domains).


The magic is in the movements, and all CrossFit’s workouts are based on functional movements. These are the core movements of life, found everywhere, and built naturally into our DNA. They move the largest loads the longest distances so they are ideal for maximizing the amount of work done in the shortest time (intensity).


By employing a constantly-varied approach to training, these functional movements at maximum intensity (relative to the physical and psychological tolerances of the participant), lead to dramatic gains in fitness. Intensity is essential for results and is measurable as work/time. The more work you do in less time, the more intense the effort.

Courtsey of CrossFit, Inc.