TRAIL LANGUAGE, PLAIN ENGLISH
Ultramarathon training glossary.
Clear definitions for ultramarathon workouts, heart-rate zones, training load, elevation, fueling and race preparation. Use this guide when a trail-running term or session name is unclear.
BUILD YOUR ULTRAMARATHON TRAINING PLANSessions
- Easy run
- Low-stress running at conversational effort. Most weekly kilometres should feel this controlled.
- Long run
- The longest session of the week. It builds time-on-feet durability and is normally easier than race effort.
- Trail long run
- A long run on terrain that resembles the race, including climbing, descending, hiking and fueling practice.
- Medium-long run
- Longer than a normal easy run but shorter than the weekly long run. It adds endurance with a lower recovery cost.
- Controlled tempo
- Sustained, measured running around heart-rate Zone 3. It should feel strong without becoming an all-out time trial.
- Hill endurance
- Repeated uphill work that develops climbing strength and running economy, with easy recovery between efforts.
- Power hiking
- Purposeful, efficient hiking on steep terrain. In an ultramarathon it is often a planned race skill, not a fallback.
- Downhill conditioning
- Controlled descending that prepares the quadriceps and coordination for technical terrain and late-race fatigue.
Effort & load
- RPE
- Rate of perceived exertion on a 1–10 scale. RPE 2–3 is easy, while RPE 9–10 is near-maximal.
- Heart-rate zone
- An intensity range based on maximum heart rate. Heat, fatigue, altitude and terrain can all affect heart rate.
- Zone 1
- Very easy aerobic effort used for recovery, warm-ups and much of the time spent on long runs.
- Zone 2
- Steady aerobic running that remains sustainable but feels more purposeful than Zone 1.
- Zones 3–5
- Moderate to maximal intensity used selectively because both training stimulus and recovery cost rise quickly.
- Weekly volume
- The total planned running distance in one week. Higher mileage is not automatically better or safer.
- Elevation gain (m+)
- The total vertical metres climbed on a route. One thousand metres of ascent is written as 1000 m+.
- Equivalent distance
- Race distance plus an allowance for climbing, used to compare the workload of flat and mountainous ultramarathons.
Planning
- Foundation phase
- The opening training phase, focused on establishing a consistent and repeatable week before adding more load.
- Recovery week
- A planned reduction in distance and intensity so the body can absorb training instead of only accumulating fatigue.
- Race-specific phase
- Training that increasingly resembles the goal race’s terrain, duration, hiking, descending and fueling demands.
- Peak training
- The final substantial training block before taper. Fitness is confirmed here rather than chased at any cost.
- Taper
- A reduction in training volume before race day while enough short running remains to maintain normal rhythm.
- Specificity
- How closely the training sessions match the distance, elevation, terrain and expected conditions of the goal race.
- Readiness score
- A planning indicator based on current volume, long-run base, training frequency and check-ins. It is not a medical assessment.
- Adherence
- The share of due sessions marked completed. Missed training informs future adaptation and should not become training debt.
- Technicality
- How difficult terrain is to move across because of rocks, roots, mud, exposure or narrow trail, independent of distance and climbing.
- Fueling target (g/h)
- Grams of carbohydrate consumed per hour. The target should be practised gradually during long-run training before race day.
Turn definitions into a personal plan.
Train 4 Ultra uses your race distance, elevation, terrain, experience and available days to build an adaptive ultramarathon training plan.
Choosing your first race? Read how long to train for an ultramarathon for planning timelines from 50K to 100 miles.
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