4 Crossfit Operational Models

• A. 10 Fitness Domains or types of adaptations
• B. Performance of athletic tasks
• C. Energy systems
• D. Sickness-Wellness-Fitness Continuum

Answer: (C)

The key idea here is that CrossFit programs are organized around energy production in the body. Work capacity across broad time domains depends on how efficiently the body can generate ATP through different metabolic pathways, and CrossFit treats energy systems as a central framework for conditioning.

There are three main energy pathways the body uses during exercise: the immediate, high-power output you can sustain for a few seconds relies on the phosphagen system; the glycolytic system fuels moderately long efforts for tens of seconds to a couple of minutes; and the oxidative (aerobic) system powers longer-duration efforts. CrossFit workouts are designed to stress these systems in varied ways and in combination, so athletes develop broad metabolic conditioning and the ability to produce work across a wide range of intensities and durations. This is why energy systems are a foundational model in understanding how workouts elicit specific adaptations and how to balance programming.

Other options describe outcomes or continua related to health or performance, but they don’t capture the framework for how different time-scales of effort are metabolically powered.