One of the foundations of the CrossFit philosophy and approach to fitness is that there is no such thing as a perfect routine. According to CrossFit, the biggest value of any routine is in leaving the routine for a new routine.
The CrossFit ideal is training for contingencies, which means that every workout needs to include a great variety of exercises. This variety is what CrossFit followers mean by core strength and conditioning. All sport-specific exercises are not core strength and conditioning.
The goal of CrossFit is to have only routines that contain no opportunity for adaptation. It is a scientific fact that adaptation occurs as a result of the same stimulus, which is why CrossFit workouts embrace long, middle and short distance metabolic conditioning and all kinds of weight-lifting. CrossFit encourages creativity and continuous variety when it comes to exercise. Being able to get through such a workout is what makes survival in unpredictable situations, such as fights and fires, possible. The goal of CrossFit is to have CrossFit athletes develop fitness that is diverse yet complete.
This approach is very different from what you can see in many other fitness programs that promote certainty, regimen, and specialisation.
In CrossFit, adaptation is a change in the body that has either a neurological or hormonal effect. According to independent research, most important adaptations occur as a result of a neurological or hormonal activity. CrossFit aims to invoke the neuroendocrine response in a human body by avoiding isolated movements.
Responses that are vital to the development of fitness include increase in testosterone and human growth hormone, which is why in CrossFit, these increments are viewed as a measure of athletic development.
The absence of neuroendocrine adaptation is one of the pillars of CrossFit. The workouts are based on heavyweight exercises, short rest periods between exercises and sets, high heart rate, and high-intensity interval training.