The Catalyst
What Is Fitness, and Who Is Fit?
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What does it mean to be fit? It sounds like a simple question — until you try to answer it.
Back in 2002, CrossFit founder Greg Glassman tackled this question head-on and argued that the fitness world had no agreed-upon definition of fitness — so he wrote his own. He defined ten physical skills that make up true fitness, and introduced the concept of the sickness-wellness-fitness continuum: a…