---
id: kb-2026-00452
title: Marathon Running
schema_type: TechArticle
category: sports
language: en
confidence: low
last_verified: "2026-05-28"
created_date: "2026-05-22"
generation_method: ai_assisted
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-marathon-running-1
    statement: A marathon is a long-distance footrace with the standard distance of 42.195 kilometers.
    source_title: Marathon race
    source_url: https://www.britannica.com/sports/marathon-race
    confidence: low
  - id: fact-marathon-running-2
    statement: ACSM guidance recommends carbohydrate intake during prolonged endurance exercise.
    source_title: Nutrition and Athletic Performance
    source_url: https://doi.org/10.1249/MSS.0000000000000852
    confidence: low
  - id: fact-marathon-running-3
    statement: World Athletics maintains official marathon records for road running performances.
    source_title: Marathon Records
    source_url: https://worldathletics.org/records/by-discipline/road-running/marathon/outdoor/men
    confidence: low
completeness: 0.88
known_gaps:
  - This compact repair keeps only source-mapped public claims from the sampled audit entry.
disputed_statements: []
primary_sources:
  - title: Marathon race
    type: encyclopedia
    year: 2025
    url: https://www.britannica.com/sports/marathon-race
    institution: Encyclopaedia Britannica
  - title: Nutrition and Athletic Performance
    type: academic_paper
    year: 2016
    url: https://doi.org/10.1249/MSS.0000000000000852
    doi: 10.1249/MSS.0000000000000852
    institution: Medicine & Science in Sports & Exercise
  - title: Marathon Records
    type: standard
    year: 2025
    url: https://worldathletics.org/records/by-discipline/road-running/marathon/outdoor/men
    institution: World Athletics
secondary_sources: []
updated: "2026-05-28"
---

## TL;DR

Marathon running is a 42.195-kilometer endurance event with performance shaped by race distance, fueling, and aerobic preparation. This repair keeps claims tightly sourced.

## Core Explanation

The previous entry had too many broad running claims for its evidence. The repaired version uses direct marathon, nutrition, and exercise-guideline sources.

## Further Reading

- [Marathon race](https://www.britannica.com/sports/marathon-race)
- [Nutrition and Athletic Performance](https://doi.org/10.1249/MSS.0000000000000852)
- [Marathon Records](https://worldathletics.org/records/by-discipline/road-running/marathon/outdoor/men)