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Exercise is a modern concept that is distinct from basic physical activity, which our ancestors engaged in primarily for survival or play. Historically, humans were physically active only when necessary to obtain food or when it was rewarding, like play. The notion of exercising voluntarily for health and fitness is a recent development, largely absent in prehistoric times, when physical exertion was linked to daily survival and hunting. This historical context helps explain why many people struggle with the idea of exercising purely for its own sake, viewing it as an unnatural act.