Ski Touring Training: A Summer-to-Winter Fitness Plan

01Winter fitness is built in summer

How do you train for ski touring? Build a big aerobic base over the summer, add climbing-specific leg endurance, protect your legs with twice-weekly strength, and sharpen with a little intensity as winter nears — and start in June, not December. That off-season sequence is the whole game; the rest of this guide is the detailed, periodised version of it.

The most common ski-touring resolution is also the most useless: "I'll get fit once the season starts." By the time the first storm lands, it's too late. The skier who spent the summer building an aerobic engine arrives in December able to climb 1,200 metres without blowing up; the skier who waited spends the first six weeks of the season becoming fit instead of being fit — gasping on the skin track, turning around early, and skiing the descents tired. The season you have in winter is the one you trained for in summer.

Ski touring is an endurance sport disguised as a snow sport. A typical tour is one to four hours of sustained uphill effort at altitude, in cold, carrying a pack, on terrain where a bad decision has consequences. Fitness in that context is not vanity — it's a safety system. The good news is that the off-season, June through the first snow, is more than enough time to build a real base if you train it deliberately.

This is a general conditioning framework for healthy adults, not medical or coaching advice (see the note at the end). Build gradually — the fastest way to lose a winter is to injure yourself in August chasing it.

02What Muscles & Systems Ski Touring Works (and What to Train)

Train the demand, not a generic idea of "fitness." Ski touring stresses four distinct systems, and a good summer plan develops all four:

1. Aerobic endurance — the engine, and the priority. The skinning ascent is a long, steady, sub-maximal effort. The system that powers it is your aerobic base: your body's ability to produce energy using oxygen and fat for hours without accumulating fatigue. It is the most important quality for ski touring and the slowest to build — months, not weeks — which is exactly why you start in summer. A bigger aerobic base means you climb at the same pace using a smaller fraction of your maximum, so you finish the ascent with reserves instead of empty.

2. Climbing-specific leg endurance. Skinning is repetitive uphill loading of the quads, glutes, calves and hip flexors, often for thousands of vertical metres. You need legs that can keep producing force long after they'd normally tire — muscular endurance, not just maximum strength. The closest summer analogue is uphill hiking or running with a pack; nothing in a flat gym fully replaces vertical.

3. Strength and stability — for the descent and for resilience. The descent is where strength matters most: skiing variable backcountry snow with a pack is eccentric, demanding work on tired legs, and it's where fatigue-driven mistakes and knee injuries happen. Leg strength, single-leg stability and a strong core protect you here.

4. Anaerobic capacity and the high end — the smaller slice. Steep bootpacks, a sprint to beat weather, breaking trail in deep snow, and skinning at altitude all dip into your higher gears. This matters, but it's the seasoning, not the meal: it's built quickly and late, on top of a deep base — never instead of one.

Common mistake: training only the high end. Spin classes and HIIT feel like "ski fitness" because they hurt, but they build the small slice and neglect the engine. A calm two-hour Zone-2 hike does far more for your December ascent.

The throughline of the whole plan is this: build the big slow engine first, add the legs, protect them with strength, and only then sharpen the top end. That ordering is what periodisation is.

03Aerobic Base & Zone 2: The Endurance Engine for Ski Touring

If you do only one thing this summer, build your aerobic base with lots of Zone-2 training. It feels almost too easy, and it is the highest-leverage work you can do for ski touring.

What Zone 2 is. Zone 2 is a low-to-moderate intensity you can sustain for a long time — roughly 60–70% of your maximum heart rate, the classic "conversational pace" where you can talk in full sentences but wouldn't want to sing. Physiologically, it's the intensity that best stimulates the adaptations that matter for endurance: more and bigger mitochondria, more capillaries feeding the muscle, and a greater ability to burn fat for fuel — sparing your limited carbohydrate stores.

Why it feels too easy (and why that's the point). Most recreational athletes train too hard on easy days and too easy on hard days, ending up in a grey "moderate" zone that builds neither a deep base nor a high end. Real Zone 2 feels slower than your ego wants. If you finish a session feeling you could have gone harder — good, that's correct.

How to do it. Any sustained, large-muscle activity works: hiking (ideally uphill, the most specific), trail running, cycling, rucking (hiking with a weighted pack), uphill treadmill. Aim for two to three sessions a week of 60–120 minutes, keeping the effort genuinely easy. A heart-rate monitor helps you stay honest; without one, use the talk test. As summer progresses, make the longest session progressively longer and hillier — a weekly "long day" that mimics a tour's duration is the closest thing to ski-specific endurance you can do without snow.

Add the vertical, and make it steep. Ski touring is uphill, so bias your aerobic work uphill. A weekly long hike or run with 1,000 metres or more of climbing trains the exact pattern — sustained ascent — you'll repeat all winter. To build the muscular endurance skinning demands, seek out genuinely steep ground: a gentle valley trail won't load the legs the way a 25–35% grade does, which is closer to a real skin track. Carry a light pack (5–10 kg) to add specificity; build both the grade and the weight gradually.

No mountains nearby? Fake the vertical. An incline treadmill at 10–15% is the most specific indoor tool; a stair machine or weighted stair repeats in any tall building load the legs the way skinning does; and on flat ground, long rides, rucking with a heavier pack and hill repeats on one short slope build the engine. Flatlanders get superb ski-touring fitness — they just add load and duration deliberately.

The 80/20 rule. Across all your training, roughly 80% should be easy (Zone 2) and only ~20% hard. Most people invert this and plateau. Keep the easy days truly easy so the hard days can be truly hard.

04Strength Training for Ski Touring: The Descent Is Where It Pays Off

Skiers underrate strength training because the ascent feels like the hard part. But the ascent is an aerobic problem; the descent is the strength problem — and the descent on tired legs, in variable snow, with a pack, is where backcountry injuries cluster. Two focused strength sessions a week, year-round but especially through summer, buy you control on the way down and resilience everywhere.

The movements that matter (lower body and core). You don't need a complicated programme. Train the patterns ski touring uses:

• Squats — build the quads and glutes that drive every kick turn and absorb every turn.
• Lunges and step-ups — single-leg, loaded patterns that mimic the alternating, uphill-step demand of skinning and bootpacking.
• Single-leg work (split squats, single-leg deadlifts, balance drills) — skiing is a single-leg sport; training one leg at a time builds the stabilising strength that protects the knee on uneven snow.
• Calf raises — the calves work hard on toe-loaded climbs and steep skin tracks.
• Core (planks, side planks, anti-rotation) — a stable trunk transfers force from legs to skis and protects your back under a pack.

How to structure it. Two sessions a week, each 30–45 minutes. Through early summer, work in a moderate rep range (8–12 reps) to build general strength and muscle; as the season approaches, shift some work toward muscular endurance (higher reps, shorter rest) to match skinning's repetitive demand, and add eccentric/control work (slow lowering, step-downs) to prepare the legs for the braking forces of descending. Progress the load gradually, not in heroic single sessions.

Don't forget mobility and a proper warm-up. Ankle and hip mobility make kick turns and the skinning stride easier, and five minutes of warm-up before strength or a big tour cuts injury risk: leg swings for the hips, deep bodyweight squats for ankles and knees, walking lunges for the glutes, and a few calf raises and single-leg balance holds for the stabilisers.

Common mistake: skipping strength because "cardio is what skiing needs." Cardio gets you up; strength gets you down in one piece. Untrained legs make tired, sloppy turns exactly when the snow is hardest. Two sessions a week is a small price for that control.

05A Ski Touring Training Plan: Periodising June to First Snow

Periodisation just means training the right things in the right order, building from the general base to the specific sharpening as the season nears. Adjust the calendar to your hemisphere and your starting fitness — the sequence is what matters, not the exact dates.

Phase 1 — Base (early summer, ~weeks 1–6). The foundation phase. Pile on the easy aerobic volume: 2–3 Zone-2 sessions a week, growing the long one, plus 2 general strength sessions (8–12 reps). Almost no intensity. The goal is a bigger engine and durable legs. This phase is the longest and the most important — resist the urge to "make it hard."

Phase 2 — Build (mid-summer, ~weeks 7–12). Add specificity. Keep the Zone-2 base, but make the weekly long session uphill with a pack and push it toward 1,000–1,500 m of vertical. Shift strength toward muscular endurance and add eccentric/descent-prep work. Introduce a little tempo — slightly harder sustained efforts — but the diet is still ~80% easy.

Phase 3 — Sharpen (late summer / early autumn, ~weeks 13–18). Now add the high end, sparingly and on top of everything: one weekly interval session (e.g. uphill repeats, 4–6 × 3–4 min hard with recovery) to lift your high-end aerobic ceiling, and the most specific long days you can manage — big vertical, a loaded pack, longer duration. This is where you turn a base into ski-touring fitness. For scale: the Croix de Belledonne by the Doménon lakes climbs 1,800 m to its 2,926 m summit, beyond the 1,000–1,500 m long days of the Build phase, while the Croix de Chamrousse by Lac Achard climbs 623 m, an easy first-tour objective (S1).

Phase 4 — Pre-season taper & skills (the weeks before first snow). Hold fitness without digging a hole: keep moving, drop the volume slightly so you arrive fresh, and shift focus to ski-specific preparation — an avalanche course refresher, transceiver practice, gear check, and route planning. If your first tours are new ground, go with a qualified pro: a mountain guide, or in France a ski instructor, who works on and off piste but not on unmarked glaciers or terrain that needs mountaineering techniques (RNCP sheet of the French ski instructor diploma). Arrive at the first storm rested and ready, not exhausted from a peak block.

Recovery is part of the plan, not a gap in it. Adaptation happens when you rest, not when you train. Build in easier weeks (e.g. a lighter every fourth week), sleep, and eat enough. Overtraining — pushing hard with no recovery — makes you slower and gets you hurt. Consistency over months beats heroics over days.

How to know it's working. You don't need a lab to track progress. Watch a few simple signals over the summer: the same hill climbed at a lower heart rate, a lower resting heart rate on waking, less heart-rate drift on long efforts, and — the most ski-specific benchmark — more vertical metres per hour on your weekly long day at the same easy effort. If those trend the right way, the engine is growing.

Started late? Compress, don't cram. If it's already August and you haven't trained, don't try to fit twelve weeks into four. Skip straight to a short Base-plus-Build block — 3–4 easy aerobic sessions a week with one growing long day and two strength sessions — hold the intensity light, and simply arrive at the season fitter than you were, with modest early-season objectives. A month of honest base beats a panic block of intervals that leaves you tired and hurt.

A summer plan is a sequence, not a pile of hard workouts. Build the big slow aerobic engine first and keep it high all summer; add specificity, then sprinkle intensity late and on top of the base — never instead of it; take a lighter every-fourth week; and taper into the first storm. Scrub the weeks and the hard band never dominates: even at peak sharpening it stays under ~15% of the weekly load. That is what 80/20, periodised, actually looks like.

06Why fitness is a safety margin, not a vanity metric

In the backcountry, fitness directly improves your safety. A fitter skier is a safer skier, in four concrete ways:

1. You move faster, so you spend less time exposed. Avalanche hazard, weather windows in the avalanche bulletin, and the daily warming cycle are all time-dependent. The faster you climb, the earlier you summit, the earlier you're off the sun-exposed slopes before the afternoon warming / melt-freeze cycle, and the more margin you have against a building storm. Speed is safety when the danger is a clock. This is why the ascent pace in the calculator below isn't just a planning number — a fitter engine that climbs at a Munter pace of 5 instead of 3 compresses your exposure window dramatically (pace × 100 is the vertical-only ceiling: roughly 500 instead of 300 metres an hour). Munter's own standard uphill pace is 4 (Backcountry Access); the 3 and the 5 are our brackets for breaking trail and for a fast, fit skier.

2. You make better decisions when you're not wrecked. Fatigue degrades judgement, and bad judgement is the root of most accidents. A skier running on empty rationalises ("we've come this far"), skips the beacon check, hurries the transition, and skis the descent sloppily. A skier with reserves can still think clearly, assess the slope, and turn around when they should. Your decision-making is only as good as your remaining energy.

3. You ski the descent in control. Most backcountry injuries happen on the descent, often on the last run when legs are cooked. Trained legs that aren't at their limit make controlled turns in difficult snow — the difference between absorbing a surprise and catching an edge.

4. You have reserves for the unexpected. A longer-than-planned tour, a partner who tires, unexpectedly deep snow, or — in the worst case — a companion rescue. The avalanche-rescue survival curve is brutal and time-critical; digging out a buried partner is exhausting, urgent work, and a depleted rescuer is a slow rescuer.

Fast is safe — but trained, not rushed. Moving efficiently to reduce exposure is a safety asset; rushing a tour you're not fit for is the opposite. The goal of summer training is to make a sustainable, unhurried fast pace your normal — so you have margin in hand, not so you can outrun a hazard you should have avoided.

The instrument below makes the speed-is-safety point concrete: set a real objective's distance and vertical, then switch the ascent pace between "breaking trail," "standard fit," and "fast & fit." Watch how many hours — hours of exposure — fitness removes from the same tour.

Fitness is a safety margin you can measure in hours. The big objective (12 km, 1,600 m) takes about 9 hours of climbing at a breaking-trail pace, but about 5–6 hours for a fast, fit skier — and every hour saved is an hour less exposed to avalanche hazard, weather, and the afternoon warm-up.

07A Sample Weekly Ski Touring Training Schedule

You don't need a coach or a lab to train for ski touring — you need a consistent weekly rhythm you can actually sustain through a summer. A realistic week looks like this:

A sample training week (mid-summer "Build" phase).

• Mon — Rest or easy mobility.
• Tue — Strength (legs + core, ~40 min) + short easy Zone-2 (30–40 min).
• Wed — Zone-2 aerobic (60–75 min, hilly).
• Thu — Strength (legs + core) or rest.
• Fri — Easy Zone-2 or rest (keep it genuinely easy).
• Sat — Long day: uphill hike/run with a pack, 2–4 h, 1,000 m+ vertical. The week's keystone.
• Sun — Easy recovery (short walk, spin, or full rest).

Fuel the work, not just the tour. Eat enough carbohydrate to support your training load — under-fuelling is a common reason easy sessions feel hard and progress stalls — and get protein across the day to rebuild the legs you're loading twice a week. On the long day itself, treat fuelling like gear: aim for roughly 40–70 g of carbohydrate per hour on efforts over ninety minutes (bars, gels, real food) and drink to thirst, more in the heat. A tour is an endurance event; fuel it like one.

Make the off-season do double duty: plan, too. The same summer months are when you should be planning your winter — building a hit-list of objectives by aspect and elevation, lining up your first tours, refreshing your avalanche knowledge and how to assess snowpack stability, and dialling in your setup. On Snow Trace you can scout routes (each with its distance, vertical and aspect), map the huts for multi-day hut-to-hut tours, and learn to time your tours with the Munter method.

This article is general conditioning guidance for healthy adults, not personalised medical or coaching advice. If you're returning from injury, managing a health condition, pregnant, or new to structured exercise, consult a doctor or qualified coach before starting. Progress gradually and stop if something hurts.

08Sources & further reading

Sources & further reading. This plan applies well-established endurance-training principles (aerobic base, polarised 80/20 intensity, periodisation, strength for sport) to ski touring:

• Steve House & Scott Johnston, "Training for the New Alpinism" (Patagonia Books, 2014) — the standard reference on endurance training for mountain athletes
• Stöggl & Sperlich, "The training intensity distribution among well-trained and elite endurance athletes"** (Frontiers in Physiology, 2015) — a review of the polarised model built on Stephen Seiler's research: about 75–80% of training at low intensity
• Always combine fitness with proper avalanche training and the official avalanche bulletin — fitness is a margin, not a substitute for judgement.