Progression Rules — Your Pacer Wiki

Definition

Progression rules are the heuristics that coaches use to decide how much training stress to add from one week (or one month) to the next. They describe the rate at which weekly volume, intensity, and long-run duration can be safely increased without tipping the athlete into overuse injury, illness, or overtraining.

The most-cited rule is the "10% rule" — no more than a 10% increase in weekly volume from one week to the next. It is a useful starting heuristic but not a universal law; the right number depends on the athlete's training age, current load, and recovery capacity.

Why it matters to runners

The body adapts slowly. Connective tissue (tendons, ligaments, fascia) remodels over weeks; bone density responds over months; neural economy improves across a season. Volume jumps that the cardiovascular system tolerates may exceed what the connective-tissue system can absorb. Most overuse injuries in endurance training trace back to a rate of progression the structural system could not keep pace with.

Equally common — and less visible — is the slow overtraining pattern from rising intensity without corresponding rising recovery capacity. A quality session added to a weekly structure that was already close to the edge of recovery can tip the system into months of staleness before the athlete realizes the cost.

Your Pacer applies progression rules descriptively: the weekly letter notes whether the rate of load increase is within a safe envelope, and raises a flag when proposed changes would exceed it.

Conventional progression heuristics

10% weekly volume rule. Weekly volume should rise no more than ~10% over the prior week's volume. More aggressive for experienced athletes with strong base; more conservative for novices or returners.
Three-up, one-down micro-cycle. Three weeks of progressive load followed by one recovery week at 60 to 75% of peak volume. The fourth week consolidates adaptation and resets the system for the next block.
No simultaneous jumps. Add volume, OR intensity, OR frequency — one at a time, not all three at once.
Double every two to three years. For athletes with a multi-year horizon, sustainable annual volume growth is typically 10 to 20%, compounding into approximate doubling across 2 to 4 years.
Long-run cap at 1/3 of weekly volume. The longest single session should not exceed roughly one-third of the week's total volume. When a long run represents half the week, it stops being a long run and becomes an unsustainable stress event.

When rules break

The heuristics are starting points. Conditions that call for slower progression:

Return from injury or layoff — progression restarts from a conservative base.
Elevated life stress, inadequate sleep, or poor nutrition — the body's recovery capacity is reduced.
Declining HRV trend or rising resting heart rate — autonomic signals that current load is not being absorbed.
Unusual terrain (vertical, heat, altitude) — the same nominal volume produces more stress.

Related terms

Training Load — CTI trajectory is the quantitative form of progression.
Periodization — the broader structure that progression rules operate within.
Recovery — the consolidation phase that makes progression sustainable.