To train for the descent, load your legs eccentrically (lengthening under tension to brake each step) two to three times a week: reverse step-downs, slow-tempo squats, and one weekly downhill run. Ten to fifteen minutes twice a week builds descent tolerance in about four to six weeks and protects the quads and knees that most late-day alpine injuries hit.
Why descents are dangerous
A summit day looks symmetric: you climb up, you climb down. The physiology is anything but. On the way up, your muscles contract concentrically - they shorten under load, doing classical work. On the way down, they contract eccentrically - they lengthen under load, absorbing your bodyweight against gravity. This is a fundamentally different kind of stress, and the body handles it differently (LaStayo et al., 2003).
Eccentric load damages muscle fibres at a far higher rate per unit of effort than concentric work. That is why your quads are toast after 1500m of descent but feel fine after 1500m of ascent. It is also why most overuse injuries on alpine routes happen on the descent - knee pain, IT band issues, ankle rolls under fatigue, slips on tired legs.
If you train only the up-leg of mountaineering, you arrive at the summit prepared and at the trailhead destroyed. The descent has to be its own training stimulus.
Eccentric vs concentric: the actual difference
Picture a squat. As you stand up, your quads contract and shorten. That is the concentric phase. As you lower back down, your quads contract and lengthen, controlling the descent. That is the eccentric phase. Same muscle, same movement, two different physiological loads.
Three things make eccentric work distinct:
- Higher force per unit effort. Eccentric contractions can produce roughly 1.3 times the force of equivalent concentric ones (Lieber & Friden, 2002). You can handle more load eccentrically than you can lift concentrically.
- More micro-damage to muscle fibres. The lengthening under load disrupts sarcomere structure more aggressively. Hence the pronounced delayed-onset muscle soreness (DOMS) 24-48 hours later.
- Slower recovery. Eccentric work takes longer to recover from than equivalent concentric. Plan accordingly: do not do an eccentric block 48 hours before your long climb.
If you trained only the climb, you arrive at the summit ready and at the trailhead broken. The descent has to be its own block.
How do you train for the descent?
You do not need a gym for this. The most effective exercises for mountain descent are mostly bodyweight or lightly loaded. Pick two or three to rotate through your week:
Reverse step-downs
Stand on a 30-50cm box. Slowly lower one foot to the floor over 4-5 seconds. Touch lightly. Push back up to standing. 3 sets of 8-10 per leg, twice a week. The slow lowering is pure eccentric work for the quad and glute.
Downhill running or hiking
A 20-30 minute moderate downhill run at zone 1-2 effort, once a week. The classic specific stimulus. Start with 10 minutes if new to it - DOMS will surprise you. Build slowly. Vogt & Hoppeler (2014) showed targeted downhill running improves descent tolerance within 4-6 weeks.
Slow tempo squats
Squat with a 5-second descent, 1-second hold at the bottom, normal-pace ascent. 3 sets of 8 with bodyweight or light dumbbells. The concentric is incidental; the eccentric is the work.
Backward walking on a treadmill incline
Counter-intuitive, but useful. Walking backward up a 10 percent incline forces eccentric loading of the quads in a different range of motion. 5-10 minutes, twice a week.
How should you move on the descent to protect your knees?
Technique saves your legs as much as strength does. Five cues that cut the eccentric load on every step:
- Shorten your stride and raise your cadence. Small, quick steps absorb load in a shorter range than long, reaching strides that jar the knee.
- Keep a soft bend in the knee and never lock it out. A locked knee sends impact straight into the joint; a bent knee lets the quad do the braking.
- Stay stacked over your feet with weight slightly forward. Leaning back to feel safer loads the quads fully and makes slips more likely.
- Use trekking poles to offload. Poles take a real share of braking force off the legs on steep ground, especially late in the day.
- Look two or three steps ahead and place each foot deliberately. Last-second foot placement is where tired ankles roll and knees twist.
How to integrate this into a training week
Eccentric work is a supplement to your aerobic and threshold sessions, not a replacement. A reasonable week for a mountaineer in the build phase:
- Mon · easy zone 2 + reverse step-downs (3 sets)
- Tue · threshold intervals
- Wed · rest or short walk
- Thu · long zone 2 hike with vertical (concentric load)
- Fri · easy zone 2 + slow tempo squats
- Sat · long mountain day, with deliberate downhill segments
- Sun · full rest
Notice that the eccentric blocks are small and never stacked into back-to-back days. The point is consistency and progressive overload, not heroic single sessions.
How do you know if your knees are ready for descent training?
Eccentric work is demanding, so screen before you load it hard. For each question below, read across to what your answer likely means and what to do. This is general guidance, not a diagnosis.
- Do stairs, especially going down, provoke pain at the front of the knee or around the kneecap?
Yes, most times: a classic pattern of kneecap irritation under eccentric load. Hold off on heavy step-downs and downhill volume and get it assessed first.
Now and then, mild: start with a low box and few reps, and stop the progression if it climbs.
No: clear to load descents progressively. - Does the knee swell or ache the day after a long hike?
Visible swelling: the joint is telling you the load exceeded what it can handle. Cut descent volume, let it settle, and see a professional if it recurs.
Mild ache that clears within a day: acceptable for now. Keep progressions small and watch the trend.
No: a good sign the joint tolerates the load. - Have you felt the knee give way or catch?
Yes: giving-way or catching can point to a mechanical issue. This is the one to take seriously; get it checked before loading descents at all.
Only when very tired: treat it as a fatigue signal, end the session, and build strength before adding volume.
No: proceed. - Is there sharp pain, not just muscle soreness, during or right after a squat or step-down?
Sharp and localised: stop the exercise. Sharp joint pain is different from muscle burn and is a reason to pause and assess.
A mild niggle that warms up and fades: reduce range and load and see if it settles over a week.
No, just soreness: expected and fine; that is the training working.
Occasional soreness is normal from eccentric work. But if any of the red-flag answers above persist, get the knee assessed by a physiotherapist or doctor before adding heavy descent load. Building strength on top of an unresolved issue makes it worse.
Recovery from eccentric load
If you have never done dedicated eccentric work, your first week will hurt. The DOMS hits 24-48 hours later and lingers. This is normal - the muscle is rebuilding stronger. By week three, the same load produces dramatically less soreness because your tissues have adapted.
Two practical points:
- Do not panic-dose. Resist the urge to "test" your descent fitness with a full day on the mountain in week one. Build gradually.
- Hydration and protein matter more than usual. Eccentric repair is protein-intensive. 1.6-2.0 g protein per kg bodyweight on training days is well-supported by the literature.
The takeaway
A mountaineer who trains the descent arrives at the summit prepared and at the trailhead intact. The exercises take 10-15 minutes, twice a week. The progression is straightforward. The only thing that has to change is the assumption that the climb is the hard part. For TTM members, eccentric blocks are programmed automatically into the build phase - see alpine training or mountaineering training plan for how that gets sequenced against your specific objective.
Common questions
What is eccentric training?
Eccentric training emphasises the muscle-lengthening phase of an exercise - lowering a weight slowly, stepping down from a height, descending a hill. It produces more force per unit of muscle than concentric (lifting) work and is the specific stimulus that prepares quads, knees, and connective tissue for the work of a long descent (LaStayo et al., 2014).
Why is descent training so often skipped?
Because the climb up gets the attention. Most fitness plans only count the ascent, but on summit day half the work is going down - and the descent is what cracks unprepared parties physiologically. Quads get demolished by eccentric load on tired legs, and an unprepared descent is the leading cause of late-day injury.
What are the best eccentric exercises for mountaineers?
Three high-leverage moves: weighted step-downs (descend a 12-inch box slowly under load), slow-tempo split squats (3-second lower, brief pause, normal-tempo up), and controlled downhill repeats on real terrain. All three target the quads and connective tissue in the descent-specific pattern.
How often should I train eccentrics?
One dedicated eccentric session per week through the base and build phases, often paired with the long weighted-carry day. Eccentric work produces 24 to 48 hours of delayed-onset soreness; schedule it where the recovery window does not interfere with the next high-quality session.
Can eccentric training prevent descent injury?
It reduces risk substantially by building the muscle and connective-tissue resilience that absorbs descent load. It does not eliminate risk - rolled ankles, slips, and fatigue-driven mistakes still happen - but a prepared quad keeps the leg actively decelerating instead of collapsing, which is the difference between a long day and a long evacuation.
What is the best descent technique to protect your knees?
Shorten your stride and raise your cadence, keep a soft bend in the knee rather than locking it out, stay stacked over your feet with weight slightly forward, use trekking poles to offload braking force, and look two or three steps ahead so foot placement is deliberate rather than reactive. Technique reduces the eccentric load on every step and works alongside strength, not instead of it.
How do you know if your knees are ready for descent training?
Screen for four things before loading eccentrics hard: pain at the front of the knee or kneecap going down stairs, swelling or ache the day after a long hike, any sense of the knee giving way or catching, and sharp joint pain (not muscle soreness) during squats or step-downs. Occasional muscle soreness is normal, but if any of those persist, get the knee assessed by a physiotherapist or doctor before adding heavy descent load. This is general guidance, not a diagnosis.