Rucking for fitness: what it is and how it fits a hybrid week

Rucking for fitness is walking with a weighted backpack. That's it. It's harder than walking, easier on your legs than running, and it fits neatly into the gaps of a week that already has running and lifting in it. It's not magic, it's not a replacement for running if you want to run faster, and it doesn't need an expensive pack and a special vocabulary.

Used well, rucking is a low-impact way to add aerobic work on days your legs need a break from pounding. Used badly, it's a heavy pack, a big jump in load, and a sore back. This post covers what rucking is, what it's good for, how to start, and where it fits in a hybrid week. If you'd rather it was planned around your runs and lifts, that's the job of a running coach in your pocket.

What is rucking?

Rucking comes from the military, where soldiers carry loaded packs ("rucksacks") on foot over long distances. As a fitness activity, it's the same thing at civilian scale: put weight in a backpack, walk.

Why it works as training is simple physics. Carrying weight makes walking harder. A review of soldier load carriage found the energy cost of walking with a backpack increases progressively with the weight carried, body mass, walking speed and grade, and that terrain also affects it (Knapik, Reynolds and Harman, 2004). In other words, you can make a ruck harder with more weight, a faster pace, hills or rougher ground. You don't have to use all four.

If you're new to training altogether, rucking can be a gentle way in alongside walking, then running. A beginner run + lift plan built around three easy runs and two strength sessions can use a ruck or a brisk walk on one of the off days without stealing recovery.

Is rucking for fitness worth it?

It depends what you want from it.

Good for:

• ›Low-impact aerobic work. Rucking is walking, so there's no flight phase and less pounding than running. On days your legs need a break from impact, it still gets you moving for an hour.
• ›Getting outside. It's a training session that doubles as a walk with the dog, a hike or a commute.
• ›Load carriage itself. If you need to carry weight on foot for work, hiking or events, training with a pack is the most specific preparation. A systematic review of military studies found that training programs including progressive load-carriage exercise produced much larger improvements in load-carriage performance than aerobic or resistance training alone (Knapik et al., 2012).

Not great for:

• ›Getting faster at running. For that, you need to run, plus a few form running drills before your quality sessions. Rucking adds aerobic work, but it doesn't train running speed or running economy the way running does.
• ›Replacing strength training. A pack on your back is load, but it's not progressive overload for your legs in the way squats and deadlifts are.
• ›Fixing a bad week. Hours of heavy rucking on top of a full running and lifting week is just more fatigue.

How rucking fits a hybrid week

The best place for rucking in a hybrid week is the same as easy running: on easy days, away from the sessions that matter.

The rules:

• ›Not the day before your long run or your quality session. Rucking is easy on impact but it's still time on your feet and load through your legs and back.
• ›Not the day after heavy lower-body lifting unless it's very light.
• ›Treat it as easy aerobic work. You should be able to hold a conversation.
• ›Count it in your weekly training load. It doesn't add running miles, but it adds fatigue.

If you're building a half marathon, running comes first. Rucking can supplement, but it shouldn't replace runs. Half marathon training weekly mileage matters more than ruck miles for that goal.

How to start rucking for fitness

Start light

The most common mistake is too much weight, too soon. Start with a pack much lighter than you think you need, on a flat route you know, for 20 to 30 minutes. Walk at a brisk pace. Add duration first, then pace or hills, and only then more weight.

A review of military load-carriage conditioning notes that march speed, grade and terrain can be adjusted to change intensity, limiting the need to adjust load weight alone (Orr et al., 2021). That's good advice for civilians too: a hillier route makes a light pack harder without making your back carry more.

Pack it properly

• ›Weight high and close to your back. The Knapik review found that keeping the load's center of mass as close as possible to the body's center of mass gives the lowest energy cost and keeps you upright, closer to unloaded walking (Knapik, Reynolds and Harman, 2004).
• ›Use a hip belt if you have one. The same review recommends hip belts on rucksacks, because they reduce pressure on the shoulders and increase comfort.
• ›Pad hard objects. A plate or a brick in a bag will find your spine.
• ›Wear shoes you already walk in. Not new boots on day one.

Build gradually

Increase one variable at a time: duration, then pace, then hills, then weight. Take a lighter week every few weeks, the same as you would with running.

How often?

For general fitness, one or two easy rucks a week is plenty alongside running and lifting. For soldiers, Orr and colleagues describe conditioning programs using load carriage about once every 10 to 14 days, combined with resistance and aerobic training (Orr et al., 2021). You're probably not carrying military loads, but the idea holds: rucking works best as one part of a plan, not the whole thing.

Rucking and running: how they compare

Rucking doesn't replace running, but it's a useful addition on days you want aerobic work without more impact.

Warming up and cooling down

An easy ruck doesn't need much of a warm-up. Start walking without the pack or at a gentle pace for five minutes. If you're rucking and then doing anything faster, like strides or drills, warm up properly. This breakdown of how to warm up before a run covers it by session type.

Afterward, keep moving for a few minutes before you drop the pack and sit down. Cool down running advice applies here too: a few minutes of easy walking is enough.

Rucking for runners who want more

If you're a runner who's rucking for variety, you can pair it with running skills work on separate days. Drills like the A-skip are worth knowing, and if you're unsure what is a skip in running, it's a rhythmic skip with a strong knee drive and a quick foot strike under the hips.

If the weather keeps you inside, a treadmill works for both. A ruck at a steep incline is a decent indoor version, and short hill sprints on treadmill are a separate, harder session for speed and power. A treadmill hill workout of longer steady efforts sits somewhere in between. Don't stack all three in one week.

Common rucking problems

Sore shoulders or back. Lighten the load, pack it higher and closer, and use a hip belt. If pain persists, see a professional.

Blisters and foot pain. Foot blisters, back strains and knee pain are among the common injuries associated with prolonged load carriage (Knapik, Reynolds and Harman, 2004). Build duration slowly, wear shoes and socks you've tested, and stop if something hurts.

Side stitches. Less common than in running, but a side stitch when running or rucking uphill can happen. Slow down and breathe deeply. If it's severe or keeps coming back, see a doctor.

Feeling too tired for the next run. The ruck was too heavy or too long. Make it easier.

How exrsz handles rucking

exrsz builds a periodized plan from your goal, schedule, level and equipment, with running and lifting balanced in one plan, and adapts each week to how you actually trained. Easy aerobic work goes on easy days, the hard sessions stay protected, and missed sessions get reshuffled instead of crammed in.

FAQ

Is rucking good for fitness?

Yes, as low-impact aerobic work. Carrying a pack increases the energy cost of walking, and that cost rises with load, pace, grade and terrain (Knapik, Reynolds and Harman, 2004).

How heavy should my pack be for rucking?

Lighter than you think to start. Build duration first, then pace and hills, and only add weight once the lighter pack feels easy.

How often should I ruck?

One or two easy rucks a week is plenty for most people who also run and lift. Keep them away from the day before your long run or quality session.

Is rucking better than running?

Not better, different. It's lower impact and easier to recover from, but it won't make you a faster runner. For running goals, run.

Can rucking replace cardio?

It can be part of your cardio, especially on easy days. If you have running goals, it should supplement your runs rather than replace them.