CrossFit is a strength-and-conditioning brand built around constantly varied, high-intensity functional movement performed in coach-led group classes. Training happens in a bare-bones, purpose-built gym known as a "box." The power of the concept lies not just in the methodology but in the community: a shared daily workout, a results-and-data culture, and a global competitive ecosystem (the Open and the Games) that turns ordinary members into a tight, loyal tribe.