# Power-Based Training for Road and Gravel Cycling

phase.fitness · Methodology · Sport-specific · cycling · Updated 23 August 2026 · HTML version: https://www.phase.fitness/methodology/training-cycling-performance

> How this document is used: it is one of the documents the phase.fitness generator reads before writing a phase. The principles below are passed to the model as context and the numbers become bands the program has to respect. The references are stripped from the prompt and kept here.

Cycling is unusual among endurance sports in that the athlete's output is directly and continuously
measurable. Power in watts is unaffected by wind, gradient, fatigue perception, or terrain, which
makes cycling the most precisely programmable endurance discipline — and also the one where
athletes most often mistake precision for correctness.

The physiological targets are the same as in other endurance sports; the difference is that here
they can be prescribed and verified.

## Key Principles

### 1. The aerobic base determines the ceiling

Sustained performance is governed by aerobic capacity and by the fraction of it the athlete can
hold for the duration of the event. Both are built primarily by large volumes of low-intensity
work, not by intervals.

Riders who replace base volume with high-intensity sessions improve quickly for several weeks and
then stop, because the intensity was drawing on a base that is no longer being extended.

### 2. Low intensity must actually be low

The most common error in cycling training is the moderate-intensity ride: too hard to be recovery,
too easy to be a stimulus, and fatiguing enough to compromise the following day's quality session.

Low-intensity rides should feel almost too easy. On climbs this frequently requires gearing that
allows the rider to stay in zone, and the discipline to use it.

### 3. Threshold is a moving target, and training zones drift with it

Functional threshold power changes across a season. Zones derived from a test performed three
months ago will be wrong — usually too easy after a good block, occasionally too hard after
illness or a break.

Retesting, or inferring threshold from race and hard-session data, every 6–8 weeks keeps the
prescription connected to the athlete.

### 4. Muscular endurance, not maximal strength, is the strength quality that transfers

Cycling force per pedal stroke is low; the demand is repeating it tens of thousands of times.
Off-bike strength work has value — particularly for older riders, for injury resilience, and for
sprint and climbing power — but it is a supporting item, and heavy leg volume during a hard
riding block simply compromises the riding.

### 5. Position and cadence are performance variables

Sustained aerodynamic position is trainable and, on the road, often worth more than a marginal
increase in threshold power. Cadence preference is largely individual, but the ability to produce
power across a range of cadences — including low-cadence, high-torque efforts — extends the
rider's usable repertoire on varied terrain.

## Guidelines & Recommendations

### Intensity zones, as a share of threshold power

| Zone | % of threshold | Purpose |
|---|---|---|
| 1 — Recovery | < 55% | Active recovery only |
| 2 — Endurance | 56–75% | The base. The majority of training time. |
| 3 — Tempo | 76–90% | Moderate. Useful but easily overused. |
| 4 — Threshold | 91–105% | Raises sustainable power. |
| 5 — VO2max | 106–120% | Raises the ceiling. Costly, used sparingly. |
| 6 — Anaerobic | > 120% | Short, race-specific. |

### Weekly structure, intermediate rider, 8–10 hours

| Day | Session |
|---|---|
| 1 | Rest |
| 2 | Endurance, 1.5–2 h in zone 2 |
| 3 | Threshold: 3 × 12–15 min at 95–100%, 5 min recovery |
| 4 | Recovery, 45–60 min in zone 1 |
| 5 | Endurance with 4 × 8 min low-cadence, high-torque |
| 6 | VO2max: 5 × 4 min at 110–115%, equal recovery |
| 7 | Long endurance, 3–4 h in zone 2 |

Two hard sessions per week is sufficient for most riders. Three is the upper bound for a
well-recovered athlete and produces diminishing returns quickly.

### Distribution

A polarised distribution — roughly 80% of *time* at low intensity, 20% at high, with little in
between — suits riders with substantial training hours. Riders limited to under 8 hours per week
typically do better with more time at threshold and sweet spot, because they cannot accumulate
enough low-intensity volume for the base to do its work.

### Block structure

- **Base (8–12 weeks):** volume accumulates, intensity stays low, muscular endurance and
  low-cadence work introduced.
- **Build (6–8 weeks):** threshold volume rises, VO2max work introduced, total volume flattens.
- **Peak (2–3 weeks):** race-specific intensity, volume reduced.
- **Recovery (1 week per 3–4 weeks throughout):** volume halved, intensity removed.

### Strength work

- 2 sessions per week in base, 1 in build, 0–1 in peak.
- Squat and hinge patterns, 3–5 sets of 4–6 repetitions.
- Single-leg work and trunk stability.
- Placed after riding, or on a separate day from the hardest rides.

### Gravel and mixed-surface specifics

Gravel adds sustained high-torque efforts, repeated surges out of corners, and substantially higher
upper-body and trunk demand from handling. Preparation includes low-cadence strength endurance,
short repeated efforts, and enough time on the actual surface — handling on loose ground is a skill,
and the fittest rider on the wrong line is slow.

### Common programming errors

- **The permanently moderate ride:** everything at tempo, nothing hard, nothing easy.
- **Stale zones:** training to a threshold measured three months and one block ago.
- **Intensity without base:** rapid initial gains followed by a plateau and stagnation.
- **Heavy leg strength volume inside a hard riding block**, which degrades both.
- **No recovery weeks**, on the theory that fitness is built during training rather than after it.

## Key Takeaways

- Volume at genuinely low intensity builds the ceiling that intensity later exploits.
- Make easy rides easy — the moderate ride is the least productive session in cycling.
- Retest or re-infer threshold every 6–8 weeks; stale zones misprescribe everything.
- Two hard sessions per week is enough for most riders.
- Choose the distribution to fit the hours available: polarised with volume, more threshold without.
- Strength work supports; it does not compete with the riding block.

## References

- Verified against the published record, with DOIs so any number here can be
- checked rather than trusted. This document previously carried no sources at all.
- **Rønnestad, B. R., & Mujika, I. (2014).** Optimizing strength training for
- running and cycling endurance performance: A review. *Scandinavian Journal of
- Medicine & Science in Sports*, 24(4), 603-612.
- DOI: [10.1111/sms.12104](https://doi.org/10.1111/sms.12104) · PMID 23914932
- — The source for treating strength work as a **complement** to endurance
- training rather than a competitor for it. Heavy strength training improves
- cycling economy; running economy improves with either heavy or explosive
- strength work. The mechanisms proposed — delayed recruitment of less efficient
- type II fibres, improved neuromuscular efficiency, greater musculo-tendinous
- stiffness — are why the gym sessions here are heavy and low-volume rather than
- hypertrophy-shaped.
- **Seiler, S. (2010).** What is best practice for training intensity and
- duration distribution in endurance athletes? *International Journal of Sports
- Physiology and Performance*, 5(3), 276-291.
- DOI: [10.1123/ijspp.5.3.276](https://doi.org/10.1123/ijspp.5.3.276)
- — The source for the intensity distribution: competitive endurance athletes
- train roughly **80% at low intensity and 20% hard**, and two hard sessions a
- week are enough to drive adaptation. This is why the easy sessions in this
- document are genuinely easy, and why the number of quality sessions is capped
- rather than maximised.

## Programs built from this document

- [Cycling training plan built on power zones and real strength](https://www.phase.fitness/training-programs/cycling-training-plan)
- [Cycling and strength training program](https://www.phase.fitness/training-programs/cycling-and-strength-program)
- [phase.fitness for cyclists](https://www.phase.fitness/for/cyclists)