Marathon Training: Physiology, Programming, and Performance

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## TL;DR

Marathon training (42.195km) requires balancing three physiological systems: aerobic capacity (VO2max, the engine size), lactate threshold (sustainable pace), and running economy (efficiency). A typical 16-20 week training plan builds from 30-40km/week to 60-100km/week, peaking 2-3 weeks before race day. The 80/20 rule — 80% of training at low intensity (Zone 1-2) and 20% at moderate-high intensity (Zone 3-5) — is the evidence-based standard for endurance athletes.

## Core Explanation

Training phases: base building (aerobic foundation, 6-8 weeks), strength/speed (hill repeats, tempo runs, 3-4 weeks), peak (race-pace specificity, 3-4 weeks), taper (volume reduction by 40-60%, 2-3 weeks). Key workouts: long run (20-35km, building mitochondrial density), tempo run (lactate threshold pace, 20-40 min), intervals (VO2max, 800m-1600m repeats), marathon-pace runs. Energy systems: during a marathon, ~97% of energy comes from aerobic metabolism; glycogen depletion ("hitting the wall") occurs around 30-35km if not properly fueled. Carb-loading (8-12g/kg body weight, 2-3 days pre-race) increases glycogen stores by 50-80%. Mid-race fueling: 30-60g carbs/hour. Elite marathon times: men 2:00:35 (Kelvin Kiptum, 2023), women 2:11:53 (Tigist Assefa, 2023). Every additional year of consistent training improves running economy by ~1%.

## Detailed Analysis

[详细分析、统计数据、历史发展和进一步阅读。待后续补充。]

## Further Reading

- [Source 1 — Marathon Training: Physiology, Programming, and Performance](https://www.runnersworld.com/)

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