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Official book companion

Put the science
into practice.

The index, glossary, references, appendices, runnable code, and continuing updates for The Endurance Code—collected in one place.

Explore the appendices Browse runnable codeSearch the book index

First edition · Resource release 1.8.2 · Updated August 2026

The Endurance Code by Alan Couzens
Reference249 index entries
Explore9 notebooks

Start with your goal

From reading to doing.

Use the quick references in the field, download a planning tool, or open a notebook and explore the models with real data.

01

Assess

Testing protocols, benchmarks, training zones, and readiness guidance.

Open field references →02

Plan

Annual, monthly, weekly, race-demands, and post-race planning templates.

Get the planning tools →03

Analyze

Self-contained notebooks for readiness, pacing, nutrition, heat, and more.

Explore the code →

Online appendices

Field-ready references.

View all appendices
APDF + HTML

Field Testing and Benchmark Protocols

Repeatable field protocols for assessing the qualities that matter, tracking change, and making better training decisions.

  • Aerobic efficiency
  • Critical power & pace
  • Durability
  • Readiness
Read online →Download PDF ↓
BPDF + HTML

Training Zone and Readiness Quick Reference

A practical field guide to intensity zones, morning signals, warm-up decisions, and matching load to readiness.

  • Zones 0–7
  • Morning checklist
  • Warm-up rule
  • Load matching
Read online →Download PDF ↓
CPDF + HTML

Athlete Planning Templates

A complete set of prompts and templates for turning athlete context, race demands, and readiness into a coherent plan.

  • Athlete profile
  • Annual plan & benchmarks
  • Weekly plan
  • Post-race review
Read online →Download PDF ↓

Book reference

Everything we kept online to keep the printed book focused.

Subject index249 terms with print page numbers →GlossaryDefinitions for the book’s working vocabulary →ReferencesComplete chapter-by-chapter bibliography →All reference materialElement lists and photo credits →

Code library

Make the models tangible.

Every notebook runs with sample data first, so you can understand the method before adapting it to your own training.

Chapter 1

Daily Heart-Rate Distribution

Compare the shape of a full day of heart-rate data with a generated demonstration dataset.

Download notebook
Chapter 3

Swim-Data Analysis

Recreate the chapter’s swim-block analysis and predict a missing 100 m performance from training-zone distribution.

Download notebook
Chapter 5

Specialization Analysis

Explore the performance relationships behind the book’s discussion of specialization.

Download notebook
See all 9 notebooks

Living companion

The book stays in print.
The resources keep moving.

Check corrections, clarifications, and resource changes against the edition on your shelf.

View updates and errata