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Why Do Humans Exercise? A Neuro-Evolutionary Framework for Discretionary Physical Effort
Miguel Ángel Rodríguez1, Boris Cheval2, Markus Gerber3
1Asturian Research Group in Performance, Readaptation, Training and Health (AstuRES), University of Oviedo, Oviedo, Spain.
Evolutionary Anthropology
|June 26, 2026
Summary
Human evolution required physical activity for survival. This review explains how modern life decouples effort from survival needs, examining how voluntary exercise repurposes ancestral neural systems for sustained physical exertion.
Area of Science:
- Evolutionary biology
- Neuroscience
- Human evolution
Background:
- Hominin evolution necessitated physical activity for survival.
- Modern environments reduce the need for physical exertion, creating an evolutionary mismatch.
- This mismatch favors energy conservation over voluntary movement.
Purpose of the Study:
- To distinguish between subsistence-based physical activity and discretionary exercise.
- To present a neuro-evolutionary framework for understanding voluntary exercise.
- To explore the evolutionary pathways and neurobiological mechanisms underlying exercise.
Main Methods:
- Review of existing literature on hominin evolution, neuroscience, and exercise behavior.
- Delineation of a neuro-evolutionary framework for discretionary exercise.
- Analysis of evolutionary pathways: homeostatic compensation, costly signaling, and reward recoding.
Main Results:
- Discretionary exercise is a repurposing of neural systems originally evolved for subsistence.
- Effort-reward valuation circuitry drives cost-benefit trade-offs in voluntary movement.
- Three pathways (homeostatic compensation, costly signaling, reward recoding) explain sustained exercise.
Conclusions:
- Neurobiological exaptation and cultural factors enable voluntary exercise in modern humans.
- Understanding these mechanisms is key to promoting physical activity despite the lack of ecological necessity.
- Voluntary exercise leverages evolutionarily conserved circuitry for reward and motivation.
Keywords:
costly signalingevolutionary mismatchhominin bioenergeticshuman locomotionphysical activityreward circuitryMore Related Videos
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