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If you check, you will find it is incredibly rare for health and fitness books and articles to define "health", "fitness" or "exercise". Body by Science[0][1] gets right to it on pages 2 and 3 to define all three:

Health: A physiological state in which there is an absence of disease or pathology and that maintains the necessary biologic balance between the catabolic and anabolic states.

Fitness: The bodily state of being physiologically capable of handling challenges that exist above a resting threshold of activity.

Exercise: A specific activity that stimulates a positive physiological adaptation that serves to enhance fitness and health and does not undermine the latter in the process of enhancing the former.

[0] https://www.amazon.com/Body-Science-Research-Strength-Traini...

[1] https://www.youtube.com/watch?v=2PdJFbjWHEU

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