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Internal Performance

Meaning

Internal performance is a comprehensive metric of the functional efficiency and coordination of the body’s major physiological systems, including metabolic rate, cardiovascular health, immune response, and hormonal signaling. It represents the measurable, deep-seated vitality of the organism, distinct from outward physical appearance or superficial fitness. Optimal internal performance is characterized by robust resilience to stress, rapid recovery, and a low allostatic load, reflecting true biological youth.