Train the Downhill. Eccentric Strength and the Art of Coming Down.
Trail Notes | Trail Running Strategies
the descent is a skill, not a survival act
Train the Downhill.
Eccentric Strength and the Art of Coming Down.
Most trail runners train the uphill. The descent is where the race is actually won or lost, where the injuries accumulate, and where years of inadequate preparation eventually show up in the quads the day after a big race.
There is a pattern that comes up in trail running communities and in coaching conversations that is almost universal. Athletes spend considerable time running uphill, building aerobic capacity and climbing strength. They do not spend anywhere near proportional time training the downhill. And then a race arrives with significant descent, the legs do not hold, the quads cramp or lock, the technique deteriorates, and the last third becomes damage control rather than execution.
Running downhill is not simply running with gravity. It is a movement skill with a specific muscular demand that must be trained progressively, just as climbing, interval work or long runs are trained progressively. The muscle action involved is predominantly eccentric, which means muscles are working while lengthening under load, and eccentric loading produces a specific and significant fatigue and adaptation profile that uphill or flat running does not replicate.
This Trail Note covers what eccentric loading actually is, why descent-specific training matters, how to build eccentric capacity progressively, and how to structure downhill progression in a trail training program without wrecking yourself in the process.
If you want to run descents well, you have to train descents. There is no shortcut through general fitness.
Descending is a specific neuromuscular skill with a specific mechanical load. It adapts when it is trained, and it fails when it is not.
Trail Note · 01
Why descending is different: the eccentric load
When you run uphill, your muscles contract concentrically: they shorten as they generate force. This is the familiar feeling of working hard. When you run downhill, the main job of the quadriceps is to act as a brake. They contract while lengthening, controlling knee flexion against the force of gravity and each footstrike. This is eccentric loading.
Eccentric contractions produce greater muscle force than concentric contractions but are also significantly more damaging to muscle fibres. The microscopic disruption to muscle tissue from eccentric loading is the primary driver of Delayed Onset Muscle Soreness (DOMS), and it is why the quads after a big descent can feel destroyed the next morning even when the uphill felt manageable.
Ground reaction forces during downhill running are substantially higher than flat running. Research by Gottschall and Kram (2005) showed that peak impact forces during descent can exceed those of flat running by 30 to 50 percent depending on gradient, running speed and technique. This force must be absorbed by the muscles, tendons, joints and connective tissue on every single step.
The good news is that eccentric adaptation is highly trainable. The repeated bout effect means the body adapts quickly and specifically to eccentric loading: after the initial exposure, subsequent bouts produce less muscle damage and soreness at the same load. But you have to earn that adaptation before the race demands it.
The body adapts to eccentric loading faster than most people expect. But only if you expose it to that loading before race day.
Trail Note · 02
Why downhill technique matters as much as fitness
Two athletes with identical fitness and identical descent exposure can have very different experiences on a steep downhill if their technique distributes load differently. Poor downhill technique tends to load specific structures excessively: heel striking on descents loads the knee extensor chain hard and increases braking forces; excessive trunk lean forward increases the risk of trip-falls on technical terrain; quad-dominant braking with minimal hip and glute involvement creates fatigue that isolates one muscle group.
Efficient downhill running technique shares load more broadly across the lower limb and distributes it through faster cadence, active hip engagement, forward lean from the ankles (not the hips), quick foot placement and relaxed arms for balance. The goal is controlled momentum, not braking.
Downhill technique cues
Shorten stride length and increase cadence. More steps, less braking per step.
Lean from the ankles, not the waist. Your body should be roughly perpendicular to the slope, not pitched back.
Look 3 to 5 metres ahead, not at your feet. This lets your brain anticipate foot placement rather than react to it.
Keep arms relaxed and slightly out for balance, not clasped or rigid.
Let the terrain dictate contact point. Midfoot or slightly forefoot on most surfaces, adapting for loose or wet conditions.
On technical or loose terrain, slow down and prioritise placement over pace. Speed comes from confidence, and confidence comes from practice.
Trail Note · 03
The gym work that directly underpins descent capacity
Downhill-specific strength work done in the gym does not replace descending in training, but it builds the capacity that makes descending safer and more effective. The key movements are those that load the quads, glutes, hamstrings and single-leg stabilisers eccentrically, or that build the force absorption capacity of the whole lower chain.
Slow eccentric squats
4-second lowering phase, controlled rise. Builds quad eccentric capacity directly. Progress to single leg (pistol variations) as strength allows.
Step-downs
Standing on a step, lower the opposite foot slowly toward the floor with control. Single-leg eccentric quad work with a balance demand. Directly replicates descent mechanics.
Reverse lunges
More controlled than forward lunges for eccentric loading. Add a 3-second lowering phase. Loads quads, glutes and hip stabilisers simultaneously.
Nordic hamstring curls
One of the most effective eccentric hamstring exercises available. Demanding: start with partial range or a band assist and progress over weeks.
Box jumps with slow landing
Jump onto a box, then step down with a 3-second eccentric control into a soft landing. Builds plyometric force absorption, directly relevant to technical descent at pace.
Single-leg calf drops
Rise on two legs, lower on one from a step edge. Builds calf and Achilles eccentric capacity which takes significant load on descent, especially steep or technical terrain.
Trail Note · 04
How to build downhill progression in training
Downhill training should be progressive, just as any other training stress is progressive. The mistake most athletes make is treating all descents as equivalent regardless of gradient, terrain type, duration and the total training week they sit inside. A steep, technical, 800m descent on tired legs after a long uphill is a very different stimulus from a gentle fire trail descent at the start of a fresh run.
The key variables to progress are gradient (steepness), duration (total descent in metres), terrain type (fire trail to technical single track), leg fatigue state (fresh or pre-fatigued), and frequency (how often per week and week-to-week).
Progression phases: 8 to 12 weeks out from a race with significant descent
Phase 1 (weeks 1 to 3): Short, moderate gradient descents on manageable terrain, fresh legs. Focus on technique cues. 200 to 400m of descent per session. Assess DOMS response to calibrate your current adaptation level.
Phase 2 (weeks 4 to 6): Increase total descent per session to 600 to 1000m. Introduce slightly steeper gradient. Begin including a descent session after some aerobic volume to start training on pre-fatigued legs.
Phase 3 (weeks 7 to 9): Replicate race-specific descent conditions. Steeper or more technical terrain if the race demands it. 1000m or more of descent per long run. Increase pace on runnable sections. Begin developing confidence as well as fitness.
Phase 4 (weeks 10 to 12 and into taper): Maintain the adaptation without accumulating excess fatigue. One quality descent session per week. Trust the work done.
Her Trails coaching cue
Do not introduce significant descent volume in the last 3 to 4 weeks before a race. Eccentric adaptation has a recovery cost. Give your body time to absorb the training before it is asked to perform.
Trail Note · 05
Managing the eccentric debt in a training week
A significant descent session has a recovery cost that most athletes underestimate. The DOMS from eccentric loading typically peaks at 24 to 72 hours post-session, which means the session you do on Wednesday can still be affecting your Thursday and Friday runs. Managing the placement of descent sessions in the training week matters.
A common structure is to put a significant descent session at the end of the long run, on a day followed by an easy day or rest day. This allows the eccentric recovery window to land in low-demand training time rather than compromising quality sessions that follow. If you also do gym-based eccentric strength work in the same week, separate it from descent running by at least 48 hours during high-loading phases.
The descent is not a reward at the end of a climb. It is a session in its own right, with its own demand and its own recovery cost. Train it that way.
Trail Note · 06
Special considerations for female athletes
Female athletes have a higher incidence of anterior knee pain (patellofemoral pain) and ACL injury compared to male athletes, and both conditions have biomechanical links to how the knee, hip and lower limb manage load during landing and descent. Research suggests that female athletes tend toward different knee valgus patterns (knees moving inward under load) that increase loading on the patellofemoral joint and the ACL, particularly when fatigue is involved.
Building hip strength, particularly gluteus medius and hip external rotators, is not just a general strength recommendation for runners. It is specifically protective for downhill running mechanics. Strong hip abductors and external rotators resist the inward collapse of the knee under eccentric load, distributing force more evenly through the limb and reducing the stress concentration at the knee.
During perimenopause, declining oestrogen affects tendon stiffness and connective tissue properties, which can increase injury risk during high-impact eccentric loading. Building descent capacity with a longer, more conservative progression timeline during peri and post-menopausal years is a sensible adaptation to this physiology, not a limitation of ambition.
The best descenders are not the bravest. They are the most prepared.
They have trained the eccentric load. They have practised the technique. They arrive at the top of the descent with a body that knows what is coming. Build that body in training, and the descent becomes the part you look forward to.
train the down, own the race
Written by the Her Trails coaching team
Trail Notes are evidence-informed coaching journals written for women who train, race and run on trails. Made to be absorbed in ten minutes and remembered for a season.
Key references
Gottschall JS, Kram R (2005). Ground reaction forces during downhill and uphill running. Journal of Biomechanics. | Proske U, Morgan DL (2001). Muscle damage from eccentric exercise: mechanism, mechanical signs, adaptation and clinical applications. Journal of Physiology. | Nosaka K, Newton M (2002). Repeated eccentric exercise bouts did not exacerbate muscle damage and recovery. Journal of Strength and Conditioning Research. | Hewett TE et al. (2006). Neuromuscular control of the knee and ACL injury risk in female athletes. American Journal of Sports Medicine.
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