Foundational Physical Axiom

Specificity Of Adaptation

Statement

The body adapts specifically to the demands imposed --- running builds running capacity, not swimming capacity

Why it matters

Prevents magical thinking about exercise --- you get what you train for, not 'general fitness'

Why Foundational

Foundational because the principle is exercise-physiology bedrock — the body adapts specifically to the imposed demands. Running builds running capacity, swimming builds swimming capacity, lifting builds lifting capacity. Cross-transfer is limited to underlying capacities (cardiovascular base, neuromuscular coordination patterns) but the specific motor patterns trained are what improve. Replicated across decades of training research. Prevents magical thinking about "general fitness" — you get what you train for. Realised's pillar architecture acknowledges this: dietary protocols don't substitute for movement protocols, sleep doesn't substitute for resistance training, and within physical practice, capacity types must be specifically trained.

What would change our mind

Falsifiability: explicit upgrade/downgrade criteria from source

• We'd revise it if replicated training studies showed large, reliable transfer between unlike activities, for example cycling fitness carrying over fully to running, or flexibility work building strength to the same degree as strength training.
• We'd narrow it if general training proved to carry over to most sporting and everyday tasks as well as specific practice does. Specificity would then become a fine-tuning rule rather than the main driver of what a person gains.
• What would NOT move us: partial overlap between activities, which the principle already allows (some shared ground between yoga and strength, partial transfer between forms of cardio); evidence that strength training need not make a person slow, since the principle says the outcome depends on how you train; individual stories of athletes who excel in a new sport; or claims that one method builds "general fitness" for every task.

Sources (5)

Related entries

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HIGH (foundational principle)
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