Strength Training for Skiers: Build It Before the Season

Lokh, founder of Forma. 1 August 2026.

Day one, last run, early afternoon. Your legs had been shouting since the top and you took the last pitch anyway.

Most people who get hurt skiing do not get hurt because a run was beyond them technically. They get hurt at the end of the day, on terrain they handled fine in the morning, because their legs stopped absorbing what the mountain was giving them and the timing went. Fatigue is the mechanism, and the day it matters most is the first day of a trip you have paid a lot of money for.

Which is why this is a training problem you solve in October, not something you manage in February.

What skiing does to your legs

Hold a position while your quads lengthen under load, repeatedly, for the length of a run, then do it again. That is a turn, and then another turn, and the physiological description of it is sustained eccentric work.

Eccentric loading is the kind that causes muscle damage and delayed soreness, which is why your legs feel wrecked after a first day in a way that no amount of gym cardio predicted. It is also the quality that fades fastest within a single day, and its failure is what puts you on the ground in the last hour.

Two other things matter and get less attention. Your glutes and hips control whether your knees track properly through a turn, which is directly relevant to the knee injuries skiing is known for. And your trunk works constantly to keep you stacked over your skis on uneven snow, all day, which nothing in a normal week prepares you for.

Aerobic fitness helps you recover between runs and on the lift. It does very little for the burn that arrives on run two. That is a strength problem.

The twelve-week build

Start twelve weeks out. Eight is the minimum that produces real change, and three weeks of panic training before a trip gives you soreness rather than protection.

Three sessions a week through the build, dropping to two in the final fortnight.

• Squat, with a slow descent. Four sets of five, lowering over three to four seconds. The single highest-value movement here, and the tempo is not optional.
• Bulgarian split squat. Three sets of six each leg, controlled on the way down. Skiing is asymmetrical and the outside leg does most of the work in a turn.
• Step-downs from a box. Three sets of six each leg, lowering over three seconds. Pure eccentric quad work, and it will humble you the first time.
• Romanian deadlift. Three sets of six, for the glutes and hamstrings that keep your knees tracking.
• Side plank and Pallof press. Two or three sets. Lateral trunk strength is what holds you stacked when the snow is uneven.
• Lateral hops or skater jumps in the last four weeks only. Three sets of six each side, landing softly. This is the closest a gym gets to the actual demand of changing edge.

Progress by adding weight when every set hits the top of the range with two or three reps still in reserve, or by slowing the lowering phase further. Do not chase the burn: wall sits and endless bodyweight squats feel ski-specific and build far less of what you need than heavy sets of five with a slow descent.

In the last ten days before a trip, cut the volume roughly in half and stop the eccentric emphasis entirely. Arriving on day one already sore defeats the whole exercise.

Once the season starts

The framing changes here, and it is worth being explicit about the switch.

Through the autumn, the gym is the training and you are building. Once you are skiing regularly, the ski days become the load and the gym moves to maintenance. A full ski day is a genuine event: hours of eccentric work, and your watch logs it as an activity, which means it registers in your training load and pulls your Body Battery down like any other hard session.

So the in-season rules look like the rest of this cluster:

• Nothing heavy through the legs in the 48 hours before a ski day. You want your eccentric capacity for the mountain, not spent on Thursday.
• Keep one or two short sessions a week, roughly half the volume of your build, holding the movements rather than progressing them.
• After a multi-day trip, give it 72 hours before heavy legs. The damage from four consecutive ski days is real and it stacks.

If your autumn already includes long days in the mountains, the eccentric demand of descending overlaps almost exactly with what skiing asks. That is covered in strength training for hiking, and the two build phases work well stacked.

Common questions

When should I start training for ski season?

Twelve weeks out, eight at minimum. The adaptations that protect your knees take longer to arrive than three weeks of panic squats.

What is the single best exercise?

A squat lowered over four seconds, or step-downs from a box. Skiing is eccentric quad work, so train eccentric quad work. Wall sits are a distant second because they train an isometric hold rather than the control that fails first.

How do I stop my legs burning after two runs?

Twelve weeks of heavy lower body work with a slow lowering phase. That burn is a capacity problem, and cardio does not fix it.

Should I keep lifting during the season?

Yes, at about half the volume, placed away from your ski days. Once you are skiing several days a week, those days are the training.

When the ski days become the training

The autumn build is the easy part to plan, because you control every input. The season is not, and that is where this gets harder.

You ski four days in a week, one of them long and one of them in bad snow that took twice the effort. You have a session pencilled in for Thursday. Whether that session helps you or puts you on the ground on Friday afternoon depends entirely on how much of your legs are actually left, and after three days of skiing you are the worst available judge of that.

Your watch is keeping score. Each ski day is logged as an activity, it moves your training load, and the overnight recovery that follows says how well you absorbed it. Forma reads that and returns one session for today, sized to what the week has already taken out of you. Recovery, not effort. After a quiet two days it gives you the full session. After four hard days it gives you something light, or tells you to leave it, and it names the signal that drove the call.

The same argument for the other mountain sport is in hiking, and the general case is in strength training for runners. Everything is on the training guides hub.