Trail and mountain: training with elevation without breaking yourself
How effort is measured when pace stops working, why the descent is what hurts, how to train it, and which kit actually changes something.
In the mountains, two sessions with the same duration and the same heart rate can leave you fresh or wrecked depending on how much you descended. Understanding that asymmetry between climbing and descending is half of trail training.
Climbing: high cost, low damage
Energy cost rises steadily with the gradient of the climb
The review on graded running describes how energy cost rises linearly as the climb gets steeper, with more hip power and more ankle stiffness, higher cadence and a shorter stride. Beyond a certain gradient, fast hiking is more efficient than jogging — and that is not giving up, it is physics.
That is why climbs are an excellent cardiovascular stimulus at low impact: you can accumulate a lot of Z2–Z3 work without the joint load of running fast on the flat.
Descending: low cost, high damage
Descending generates muscle damage out of proportion to its cardiovascular cost
On trails, the repeated pattern of eccentric contractions while descending markedly raises muscle damage markers and reduces force production for days, according to a systematic review of 15 studies. Oxygen uptake, meanwhile, drops: how easy the descent feels is exactly what makes it dangerous.
Descending is trained progressively
Throwing in a long day of descents with no preparation produces days of crippling soreness. Introduce negative elevation gradually, starting with gentle gradients, and remember the protective effect of one descending session lasts weeks.
How to measure effort
- Positive elevation
- The volume metric
- Time on feet
- The load metric
- Perceived effort
- The intensity metric
Plan in accumulated vertical gain per week, not just kilometres.
Two hours are two hours, whether you cover 10 or 18 km.
Pace per km means nothing on a 15% gradient.
An equivalence used by coaches — common practice, not evidence — is to count 100 metres of vertical gain as roughly 1 kilometre on the flat when comparing sessions. It stops you kidding yourself about “short” weeks that are actually very hard.
Typical mountain sessions
- 1
Long climbs in Z2
3–5 × 8–12 min climbing at threshold effort, descending very easy. High aerobic stimulus, low damage.
- 2
Controlled descents
4–8 × 2–3 min descending at moderate intensity, focusing on high cadence, short steps and looking ahead. Start with one and add volume every two weeks.
- 3
Long run with specific elevation
Reproduce the profile of your target race: if it is 1,500 m of gain over 25 km, prepare sessions with that ratio, even if they are shorter.
- 4
Fast hiking with poles
If your race has steep ramps, train them hiking with poles. Pole technique is trained; improvising it on race day costs more energy than it saves.
Kit that actually changes something
- Grip. The lug pattern matters more than cushioning on wet or loose ground.
- A pack or vest that fits. A bouncing vest causes chafing and messes up your breathing.
- Poles, on races with big elevation: they share load with the upper body and help hold cadence on ramps.
- Mandatory kit. Mountain races check it: space blanket, windproof, light, water. Train with it on at least once.
Takeaways
- Plan in elevation and time on feet, not in kilometres.
- Climbing trains the engine; descending breaks fibres.
- Introduce descents gradually and treat them as a quality session.
- Rule of thumb: 100 m of gain ≈ 1 km on the flat.
- Rehearse the full kit before the race, not on race day.
Sources for this chapter
- [1]Lu Z, Suo B, Deng L, et al. (2025). A review of uphill and downhill running: biomechanics, physiology and modulating factors. Frontiers in Bioengineering and Biotechnology. review
- [2]García-Valiente I, Pradas F, Ortega-Zayas MÁ, et al. (2026). Muscle, Neuromuscular, and Cardiac Damage in Trail Running: A Systematic Review. Muscles. review