Rucking is walking with weight. It gives you strength work and zone 2 cardio at the same time, at a fraction of the joint cost of running. Start around 10-15% of your body weight, add stairs or hills once that feels easy, and — critically — log it in WHOOP as a ruck rather than a run, or your strain will badly understate what you actually did.

What Rucking Actually Is

Rucking is a way to incorporate strength training with some cardio, in the form of a walk. That's the pitch, and the reason it's worth your time: most training forces you to pick a lane. Lifting builds strength but does little for aerobic base. Running builds aerobic base and beats up your joints. Rucking sits in the overlap — your legs, hips, and trunk are under real load the entire time, while your heart rate parks itself in a moderate zone for the duration.

Peter Attia, who has made rucking one of the pillars of his own training, puts the trade-off plainly: it "increases basically the strength and cardio fitness without increasing the joint tension." That last clause is the part people miss. You get a meaningful training stimulus without the repetitive impact that makes running hard to sustain as you get older.

It also has the rare property of being genuinely sustainable. I've written before about the stretch where a three-mile ruck with a 50-pound pack plus 27 flights of stairs was my daily morning workout — that routine held for two and a half to three years, which is not something I can say about any gym program I've ever started.

Start Lighter Than You Think

The most common way to ruin rucking for yourself is to load up on day one. Start small — somewhere in the range of 10-15% of your body weight — and stay there until it genuinely feels easy. For a 200-pound person that's a 20-30 pound pack, which will feel almost disappointingly light for the first ten minutes and entirely sufficient by minute forty.

From there, move up gradually. Attia recommends beginning at roughly one-sixth of your body weight and working up over time toward one-third — slightly heavier than where I'd tell someone to start, but the shape of the advice is identical: begin conservative, progress slowly. Andrew Huberman, who does a long weighted ruck as part of his weekly routine, gives the same warning in blunter terms: "Add weight slowly. Don't get hurt!"

The reason for the caution is that rucking hides its own difficulty. Your cardiovascular system adapts to carrying load much faster than your feet, shins, and shoulders do. You'll feel ready for more weight well before your connective tissue agrees, and the injuries that come from getting this wrong — shin splints, shoulder impingement, angry Achilles tendons — will cost you more weeks than the extra plate would have earned you.

Add Climbs to Keep It Interesting

Rucking on flat ground is already effective. But adding climbs — stairs or hills — greatly enhances the workout and varies it enough to keep it from getting stale, which matters more than people admit. A workout you'll actually repeat for two years beats a better workout you'll quit in six weeks.

Going up is the obvious part: elevation under load spikes your heart rate and turns a steady walk into interval work without changing your pace. The less obvious part is coming down. Descending under weight is eccentric loading — your quads are lengthening under tension to control the descent rather than shortening to drive it — and that's a specific, valuable adaptation.

Attia frames the payoff in terms most training advice never bothers to: "When you're walking down the hills, you're really strengthening your legs. This is called developing the brakes. When you get older, most people fall because they lose the brakes." Every flight of stairs you walk down with a loaded pack is training the exact capacity that keeps people upright in their seventies. It's the least glamorous part of the workout and probably the most valuable.

My Parking Structure Workout

Here's one session I came back to over and over, and it requires nothing but a pack and a parking garage:

Two miles of loaded walking as bookends, with 27-36 flights of climbing and the same number descending in the middle. The structure is what makes it work: the walk out is a warm-up, the rounds are the actual training block, and the walk home is a built-in cooldown you can't skip because it's the only way to get back.

A parking garage is close to ideal for this — the flights are uniform, it's sheltered from weather, and there's no traffic to negotiate. Any stairwell with a reliable number of flights does the same job.

Rucking Is Not Running With a Weight Vest

These get lumped together and they shouldn't be. Running with a weighted vest is plausible for some people, but understand that it's a different activity with different demands.

There's also the impact question, which brings us back to Attia's framing. The appeal of rucking is added load without added joint tension — and that works precisely because walking keeps one foot on the ground. Running already multiplies the force going through your joints on every stride; adding weight to it pushes in the opposite direction from the thing that makes rucking sustainable. If you want to run with a vest, fine — just don't assume you're getting rucking's low-impact profile while you do it.

Log It as a Ruck, Not a Run

This one cost me real data. For a long time I logged these sessions in WHOOP as runs, because "hiking" didn't feel right and there wasn't an obvious better option. That was a mistake.

WHOOP now has a dedicated rucking activity, and it doesn't just relabel the workout — it factors in strength training and adjusts strain accordingly. The moment I switched, the picture changed: my rucks were considerably more strenuous than I'd been giving them credit for. Sessions I'd been treating as moderate cardio were registering as serious training days, which in turn changed what my recovery scores were telling me to do the next morning.

If you're rucking and logging it as something else, you're not just mislabeling a workout. You're feeding your recovery model bad inputs and then trusting the output. Worth fixing.

One related note: rucking with real weight is a high-sweat activity, especially with climbs involved. It's one of the sessions where electrolytes actually earn their place rather than being a default add-on.

The One Thing I'd Change

My complaint with WHOOP's rucking activity is that I can't tell it how much weight I'm carrying. Clearly my 50-pound pack is a harder workout than a 20-pound vest — that's not a subtle difference, it's more than double the load. But as far as the activity logging is concerned, a ruck is a ruck.

It's a strange gap, because the weight is the entire variable that separates rucking from walking. Everything else — pace, distance, elevation, duration — WHOOP already captures. Pack weight is a single number the user would happily supply, and it would meaningfully sharpen the strain calculation for the exact activity they built the feature for. Heart rate picks up some of the difference indirectly, but it can't distinguish between a heavy pack on an easy route and a light pack on a brutal one.

Until that changes, I note the weight manually in the journal and keep it in mind when I'm reading a strain score. It's a workaround, not a fix.

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