Training for hikers: how to last a full day on the hill

The legs usually go on the way down, not on the way up — somewhere after the sixth hour, when the knees start to burn and the path back looks longer than the one you climbed. A full day on the hill comes down to three things you can measure: how many hours a week you spend on your feet, how much strength you have in one leg, and how much you manage to eat and drink while moving.

What actually wears you out

Walking uphill with a 6–10 kg pack costs roughly 400 to 600 calories an hour, depending on body weight, gradient and pace. Over eight hours of movement that is 3,000 calories or more, and almost nobody eats more than a thousand on the trail. The gap comes out of what you were carrying internally, and that is where the first crack appears.

Height gain is a better measure of effort than distance. A reasonably fit hiker covers 300 to 400 metres of ascent an hour and holds it all day; an unfit one starts at 500 and is down to 150 by the second hour. A full-day route usually means 1,000 to 1,500 metres up and the same back down.

The fatigue has three separate sources: an empty fuel tank, local endurance in the legs, and muscle damage from the descent. Each responds to different training, which is why "just get out more often" is only part of the answer.

The base: hours on your feet

Most of the preparation is dull, and that is fine. Three to four sessions a week, one of them long, does more than any clever programme. On the long session the pace should let you speak in full sentences; if you are breathing through your mouth and answering in two words, it is too hard.

Start the long walk at two hours and add 15 to 20 minutes a week until you reach five or six. Keep the weekly increase modest — around 10 per cent is what most people absorb without irritating a tendon — and every fourth week drop the volume by 30 to 40 per cent.

No hills nearby? A treadmill at 10 to 15 per cent, or a stairwell, does the same job. Thirty to 45 minutes of uphill with the pack you actually carry is far closer to hiking than flat running.

Strength: every step is one leg

A step uphill is a loaded single-leg squat, repeated a few thousand times. Two short strength sessions a week, 30 to 40 minutes each, move the needle more than an extra hour of walking. The core lifts are the squat, the Romanian deadlift, the reverse lunge, a step-up onto a 40–50 cm box, and calf raises.

Three to four sets of 6 to 10 reps with a load that leaves two reps in reserve. If you are new to the barbell, get the pattern right on the squat and the deadlift before you add plates.

A useful readiness test: 20 step-ups per leg onto a 45 cm box with an 8 kg pack, no rest, no pushing off with the trailing foot. Most people who pass that cleanly cope with eight hours on the hill.

The descent is what breaks you

Going down, the muscle works while lengthening, and that eccentric load causes the microdamage you feel 24 to 48 hours later. People who climb often but rarely descend for hours are exactly the ones who run out of legs on the way back.

The fix is simple: once a week, for four to six weeks before the big day, add 15 to 20 minutes of controlled downhill — a hillside, a long staircase — slow and quiet, without slamming the heel. The first session will leave you sore for three days; the third barely at all.

Poles help. The evidence is strongest for a lower sense of effort and less load on the legs over a long descent. If your knee already complains on deep bends, knee pain in the squat is worth sorting out before the season, and much of the same pre-season knee work applies to skiers.

Pack, food and water

For a day out, 5 to 8 kg is realistic. Past about 20 per cent of body weight the pace drops noticeably and walking technique falls apart. Carry the pack in training too, not only on the day.

After the first hour, take 30 to 60 g of carbohydrate an hour, by the clock rather than by appetite — hunger on the trail arrives late. Fruit, biscuits, bread and cheese, a gel: the format matters less than the amount.

Drink 400 to 800 ml an hour, more in heat, and add salt if you sweat heavily or the day runs past four hours. Small sips taken regularly beat a litre at the summit.

What a week looks like

Monday strength, Tuesday an easy 30–40 minute walk, Wednesday 40 minutes uphill or on stairs, Thursday off, Friday strength, Saturday the long day, Sunday an easy 45 minutes or nothing. Eight to twelve weeks of that is enough for a serious full-day ascent.

In the last seven days, halve the volume and drop the heavy sets. Poor sleep, irritability and a morning heart rate that will not settle are signs of overtraining — a cue to take volume away, not add it.

When to see a doctor

Chest pain, fainting or breathlessness out of proportion to the effort are not fitness problems and need checking before your next day out. The same goes for a knee that swells after every descent, pain that wakes you at night, or numbness down a leg.

If you have a diagnosed heart, lung or joint condition, or you are over 40 and have been inactive for a long time, a quick conversation with a doctor before the volume climbs is a sensible step.

The short version

• Three to four sessions a week on your feet, one of them long and growing towards five or six hours.
• Two strength sessions a week: squat, Romanian deadlift, step-up, lunge, calves — 3 to 4 sets of 6 to 10.
• Train the descent: 15 to 20 minutes of controlled downhill once a week, starting four to six weeks out.
• 30 to 60 g of carbohydrate and 400 to 800 ml of fluid per hour, taken by the clock.
• A 5 to 8 kg pack for a day route — and wear it in training, not just on the hill.