I like CrossFit's definition, but here's a stab at another one. There's a lot you can say about what fitness is or isn't, what's necessary and what isn't. In a funny way a person's training revolves around their own idea of fitness. Here's mine:
Fitness is the body's ability to do work, perform tasks, meet challenges and overcome obstables, requiring strength, balance, agility, flexibility, speed, endurance, and health.
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