Loaded Carry Training: Build Core Stability and Grip Together With a Suitcase Carry

If You Can't Hold a Suitcase Carry for 30 Seconds Even Though You've Been Doing Planks

Signing up for a gym feels like too much, and the only core exercises a lot of people do at home are planks and crunches. But then a heavy grocery bag in one hand at the store, and within a few steps the opposite side of your back starts aching — a feeling that's probably familiar. Planks are a static exercise where your trunk holds still against a fixed floor, which is a different skill entirely from resisting a load that's pulling you sideways while you actually move.

Grip works the same way. You can squeeze a hand gripper open and closed a hundred times, and your grip still gives out halfway between the parking lot and the elevator carrying a 5kg pack of water bottles, forcing you to set it down for a second. That's because squeezing hard for an instant and holding on without letting go over time are two entirely different abilities.

A loaded carry trains both of these at once: the strength to keep your trunk from collapsing sideways, and the grip to hold an object without dropping it over a stretch of time. Among carry variations, the "suitcase carry" — holding weight in just one hand while you walk — is especially accessible because it needs no special equipment, just a water jug, a detergent bottle, or a backpack loaded with books from around the house. What follows covers how to start a suitcase carry safely and build it up in stages. If you want to strengthen your core fundamentals further, pairing this with the McGill Big 3 Core Exercise Guide is a good idea as well.

Why a One-Sided Carry Trains Core and Grip at the Same Time

What a Two-Handed Carry Can't Teach You: Anti-Lateral Flexion

Split the same weight evenly between both hands and the load on each side cancels out, so there's almost no torque pulling your trunk sideways to begin with. Hold the weight in just one hand, though, and torque pulls your spine toward the loaded side — resisting it requires the muscles on the opposite side of your torso, the quadratus lumborum and the internal/external obliques, to contract hard and keep the spine upright. This "resistance to sideways collapse" is called anti-lateral flexion, and it's a concept the Canadian spine biomechanist Stuart McGill has long emphasized as one of the core pillars of practical core training.

A study by McGill, McDermott, and Fenwick (2009), published in the Journal of Strength and Conditioning Research, compared several strongman events — a symmetrical two-handed farmer's carry, a carry with uneven weight split between the hands, and a one-sided carry — measuring trunk muscle EMG activity and lateral spine bend angle across them. The more the load shifted to one side, the more the spine bent laterally and the more activity rose in the opposite-side obliques and quadratus lumborum. That said, this study was conducted on a small number of trained strongman competitors, so applying the exact figures to the general population or a rehab setting calls for some caution — it's best read as a reference for the underlying direction: the more asymmetric the carry, the more the anti-lateral flexion muscles get recruited.

Grip Is a Matter of Holding On, Not an Instant of Force

A study by Leong et al. (2015), published in the medical journal The Lancet, followed roughly 140,000 adults across 17 countries in the PURE (Prospective Urban Rural Epidemiology) study to examine the relationship between grip strength and mortality. Every 5kg drop in grip strength was associated with about a 16% higher risk of all-cause mortality (hazard ratio 1.16), with similar associations for cardiovascular death, stroke, and heart attack risk. Because this is an observational study, though, it doesn't prove that deliberately training grip strength actually lowers mortality risk — grip strength is better interpreted as a biomarker reflecting overall muscular condition and general health rather than a cause in itself.

Even so, there's plenty of reason to train grip regularly. A hand gripper mainly trains momentary peak force — squeezing hard and releasing within a second or two — while a loaded carry trains an endurance style of grip that holds on without letting go for the 30 seconds to a minute it takes to walk with a weight. In everyday life, moving belongings or holding onto a handle for an extended time calls on this endurance grip far more often than peak grip strength.

What Changes Once Walking Is Added

Unlike a plank or side plank held still in place, a carry shifts your center of mass with every step, so the direction of the load on your trunk keeps changing subtly the entire time you walk. The force the loaded side has to resist differs slightly the instant the right foot lands versus the instant the left foot lands, so a carry trains not just static muscular endurance but also the muscles' ability to react to changing force with every stride.

Signs You Should Not Start Carry Training Yet

If any of the following applies to you, see a medical professional before starting the lifting and walking techniques described below. This guide's approach focuses on functionally building core stability and grip in the absence of an underlying condition, and the signs below may fall outside that scope.

• Numbness or a pulling sensation radiating down one leg when bending or lifting weight: this may indicate a disc pressing on a nerve, in which case a medical visit takes priority over self-directed training.
• A bulge or lump you can feel or see in the abdomen or groin area when bearing down: this could be a hernia, and carrying weight while walking can worsen the condition, so see a surgeon first.
• A wrist or shoulder fracture or ligament injury within the past 3 months, or active numbness from carpal tunnel syndrome: gripping and holding weight can place direct strain on the affected area.
• Uncontrolled high blood pressure or a heart condition that limits breath-holding or straining movements: the bracing and breath control involved in carry training can affect blood pressure, so check with your doctor first.
• A feeling of your abdomen separating or bulging forward under intra-abdominal pressure from mid-pregnancy onward (possible diastasis recti): discuss appropriate weight limits with an OB-GYN or a women's health physical therapist first.
• Dizziness or balance impairment that raises fall risk while walking: carrying weight makes balance harder to maintain and raises the risk of a fall.

If none of the above applies and your goal is simply to functionally build core strength and grip, go ahead and start with the sequence below. If pain in your side or wrist keeps recurring after 3-4 weeks, have your form evaluated.

The Suitcase Carry Done Right: It's Decided the Moment You Grip and Brace

Before your posture while walking even matters, what's already decided is the moment you first lift the weight. If your spine is already leaning sideways or your bracing is already gone the instant you pick it up, that broken alignment carries through the entire walk.

Positioning Before You Lift

• Set the water jug or backpack beside your foot, as close to your body as possible. If it's sitting farther away, step toward it before bending down.
• Lower down using a hip hinge — bending the knees and pushing the hips back — to grip the handle. Rounding the back and folding only at the upper body puts the spine in an unstable position before the weight is even lifted.
• When you grip the handle, wrap your whole hand around it and lock your thumb over your fingers in a full "crush grip." Gripping lightly with just your fingertips means the grip gives out within a few steps.

The Lift and Bracing

Right before standing up with leg strength, brace first by pushing your abdominal wall outward from the inside, as if bracing for a light punch to the stomach. Hold that tension as you extend your legs to stand, and even with weight on one side, your spine's segments stay stacked and resist shifting against each other like a single column. Right after standing, check that the bottom of your ribcage is stacked directly over your pelvis, and that the shoulder on the loaded side hasn't hiked upward.

Common Mistakes

• Leaning the upper body toward the loaded side: it's an instinctive move to shift toward the weight to ease the load on the arm, but doing so robs the anti-lateral flexion muscles of the chance to work, which actually reduces the training effect. Practice in front of a mirror to check that both shoulders stay level.
• Shrugging the loaded-side shoulder up toward the ear: as grip fatigue sets in, a compensatory habit of trying to support the weight with the shoulder tends to appear. Keep the shoulder pressed down and rely on the sense of the trunk's side muscles holding the load instead.
• Holding your breath: bracing and holding your breath are not the same thing. You should be able to keep your abdomen braced while still taking short breaths — that's the normal state.

Staying Stable While You Walk: Stride and Turning

Even with a solid brace in place, the wrong walking pattern can undo your form within a few steps. A carry isn't simply "walking while holding weight" — it's repeated practice at continually recapturing a posture that keeps trying to collapse with every stride.

Shorten Your Stride Slightly

Walking with your normal stride length lets the pelvis rotate more from side to side, which sways the loaded side of your trunk even more. Shorten your stride by roughly 10-20% from normal and keep short, stable steps, and the reduced pelvic rotation cuts down on how much your trunk sways as well. Point your toes straight ahead and keep your gaze 3-4 meters in front of you as you walk.

Posture Before Speed

The instinct is to walk fast and get it over with, but the faster you go, the wider the sway toward the loaded side becomes. Start at roughly 70-80% of your normal walking speed to get a feel for keeping your posture from breaking down, then gradually pick up the pace once your form is stable.

Turning Is the Riskiest Moment

Training back and forth in a tight space often means whipping the upper body around to turn, and that instant is exactly when bracing tends to release suddenly, putting a sharp twist through the spine. When you need to turn, stop walking completely first, pivot in place with several small steps to change direction, then start walking again.

Common Mistakes

• Swinging the unloaded arm excessively: it's an instinctive reaction to help with balance, but the more the arm swings, the more the upper body rotates, which actually increases twisting through the spine. Keep the free arm naturally close to the side of the trunk with only a light swing.
• Turning your head to check the loaded side: turning the head throws off the alignment of the entire spine, starting from the neck. Keep looking forward, and if your grip feels unstable, stop walking and reset your hold on the handle instead.

A 4-Week Plan: From Two-Handed Carry to Offset Carry

Understanding the bracing and walking technique intellectually doesn't mean much if you jump straight into a heavy one-sided carry — your grip will likely give out or your form will break down within a few days, and it's easy to lose interest. The program below starts by building the basic pattern with a symmetrical two-handed carry, then gradually progresses to a one-sided, and eventually asymmetric, carry.

Contraindications to Check Before Starting

Consult a medical professional before starting the program below if any of the following apply to you.

• Active disc herniation currently causing leg numbness or altered sensation
• A diagnosed hernia, or a bulging sensation when intra-abdominal pressure rises
• Wrist or shoulder surgery or a fracture diagnosis within the past 3 months
• Uncontrolled high blood pressure, arrhythmia, or another condition limiting straining movements
• Mid-pregnancy onward, or suspected diastasis recti — discuss weight limits separately with a medical professional

Stage 1: Symmetrical Two-Handed Carry to Build the Pattern (Week 1)

Starting position: Place two containers of equal weight — water jugs or bags loaded with books — beside each foot, hinge at the hips to lower down, and grip a handle in each hand.

Movement: Brace first, then stand up using leg strength, and check that your ribcage is stacked over your pelvis. Walk 10-15m with a shorter-than-normal stride, and when you need to turn, stop completely, pivot in place, then continue walking.

Breathing: Keep the brace in place while taking short breaths in through the nose and out through the mouth. Be careful not to hold your breath.

Sets and frequency: 3 round trips of 10-15m, 3-4 times per week.

Common mistake to correct: Letting the upper body pitch forward the moment the weight is lifted is common. Build the habit of pausing for 3 seconds in the standing position before walking to check the ribcage-pelvis alignment.

Stop signal: Stop immediately and consult a medical professional if you feel a sharp pain on one side of the back or a sharp pain in the wrist while walking.

Stage 2: Switching to a One-Sided Suitcase Carry (Weeks 2-3)

Starting position: Hold just one of the same weights used in Stage 1 in one hand, letting the other arm hang naturally.

Movement: Brace, then walk while staying aware the entire time of whether the loaded-side shoulder is staying level with the other, not riding up. After a set distance, switch hands and repeat the same distance on the other side.

Breathing: Keep the same rhythm as Stage 1, and check yourself for unconsciously holding your breath as the grip fatigues in the later part of the walk.

Sets and frequency: 15-20m each side, 3 times per side (6 total), 3-4 times per week. Always train both sides for an equal number of reps.

Common mistake to correct: Leaning the upper body toward the loaded side is the most common error. Filming a short video from the side on your phone often reveals a lean far greater than what you feel yourself.

Stop signal: Pain appearing at the center of the back or right beside the spine — rather than on the unloaded side — signals that your form is breaking down; reduce the weight and return to Stage 1.

Stage 3: Raising the Difficulty With an Offset Carry (Weeks 4-5)

Starting position: Hold a slightly heavier weight than in Stage 2 in one hand and a lighter one in the other (for example, 6-8kg on one side, 3-4kg on the other).

Movement: Walk while maintaining the brace with different weights in each hand. Feel both the pull toward the heavier side and the slack on the lighter side at once, and focus even more on keeping the spine vertical.

Breathing: Keep the same rhythm as Stage 2, and check that the rhythm doesn't fall apart partway through as the distance increases.

Sets and frequency: 2 round trips of 20-25m (alternating which hand takes the heavier weight), 3 times per week.

Common mistake to correct: Rushing to finish quickly instead of reducing the weight on the heavier side is common here, but that just means racking up reps with broken form, which reduces the training effect. It's better to keep alignment even if it means using less weight.

Stop signal: If soreness on one side lingers into the next day, or your grip keeps giving out and dropping the handle, drop back to Stage 2 weight for a few more days before trying again.

Stage 4 Onward: Integrating Into Daily Life (Week 6 Onward)

Starting position: Start from whichever combination in Stage 3 you handled comfortably.

Movement: Extend the distance to 30m or more, or expand the course to include a few stairs. Once this feels natural, apply the same bracing and alignment principles when carrying actual groceries or a laundry basket in daily life, not just during dedicated training.

Breathing: As the distance grows, it helps to plan a spot in advance where you pause once to reset your breathing.

Sets and frequency: Maintain 2-3 times per week, and increase either the weight or the distance — not both at once.

Common mistake to correct: Once in the maintenance phase, people tend to skip checking their form and just keep adding weight. Film your form again about once every two months to check.

Stop signal: If new pain shows up that wasn't there in earlier stages, or the time you can hold the grip actually gets shorter, reduce the weight and take a recovery period.

Week-by-Week Progression Plan

The standard for progressing is "do my side and wrist still feel fine the day after finishing that weight and distance." If soreness still lingers a day later, repeat the same stage for a few more days before increasing weight or distance.

Near-Infrared Conditioning for Side and Forearm Recovery After Training

Starting a suitcase carry can bring on unfamiliar soreness in the opposite-side quadratus lumborum and the forearm of the gripping hand. These are muscles that planks and hand grippers rarely engage much, so this is a normal response to newly working them — but this same soreness is also what causes some people to give up on training partway through. Some people use near-infrared (NIR) conditioning as a post-training relaxation routine during this period — it's worth understanding accurately that this is not a treatment for muscle soreness or joint problems, but a wellness routine meant to help you keep training consistently.

The Basic Idea

• Cellular metabolism support: near-infrared wavelengths are understood to reach tissue beneath the skin and interact with cellular energy metabolism, an area studied in the field of photobiomodulation.
• Local blood flow changes: a warm sensation along with a temporary local increase in blood flow at the treated area is commonly reported.
• Post-training relaxation: used to support the relaxation of the side and forearm muscles that get sore after carry training.

Many people find themselves using this relaxation routine nearly every day during the first 1-2 weeks, which coincides with when soreness peaks as the body adapts to a new movement pattern. Once the pattern is established and soreness eases from week 4 onward, cutting back to 2-3 times a week is perfectly fine.

How to Work It Into Your Routine

If you use a near-infrared healthcare device like the CIRIUS LED Pro or Compact, keep the following in mind. This is a conditioning support routine, not a diagnostic or treatment procedure for muscle or joint conditions.

• Keep the device 5-10cm from your skin, aiming it at the opposite-side torso and forearm area.
• Apply it for 10-15 minutes right after carry training.
• Using it consistently as a recovery routine once you reach the Offset Carry stage can help you keep training consistently.
• It does not replace existing treatment or a medical professional's instructions — if pain persists or numbness appears, be sure to consult a specialist alongside it.

Choosing a Weight and Setting a Starting Load: Details That Prevent Injury

What to Use for Weight

• Fill a bag with a handle with several 2-liter water bottles, or use a container like a detergent jug with a sturdy, comfortable handle. A thin or sharp-edged handle will end your training session because of hand pain, not grip fatigue.
• Loading a backpack with books or sandbags and gripping the lower part of the shoulder strap with both hands instead of a handle also works, but the short grip surface tends to bend the wrist, so a jug-style container is recommended when starting out.
• If you have dumbbells or a kettlebell at home, of course you can use them, but the whole point of this training is that it requires no special equipment to begin. Maintaining your brace and alignment matters far more than which weight you choose.

Gauge Your Starting Weight by Body Weight

Weighing everything on a scale every time is tedious, so use roughly 8-10% of your body weight (about 5-6kg for a 60kg person) as your starting point for the symmetrical two-handed carry. Moving to a one-sided carry increases the demand even at the same weight, so it's safer to drop 10-20% below what you used in Stage 1 rather than carrying the same load in one hand.

Footwear and Flooring

Wear non-slip-soled shoes and train on flat ground with clear visibility. A carpeted area or a doorway threshold makes it easy to catch a foot and momentarily lose balance, and losing balance while holding weight triggers a reflexive twist of the upper body that puts a sudden force through the spine.

Training Outdoors

If you use an outdoor space like a park or parking lot, avoid uneven ground, and start with a short, straight stretch of about 20-30m before extending the distance once you're comfortable.

Correcting Common Misconceptions

"Heavier weight means a better core effect"

→ Increase the weight while walking with broken form and you end up stimulating the wrong compensatory muscles in the shoulder or lower back instead of the anti-lateral flexion muscles. The moment your shoulder shrugs up or your upper body starts leaning toward the weight is your personal ceiling — walking below that weight while maintaining alignment produces a better core training effect.

"Training grip alone with a hand gripper is enough without carries"

→ A hand gripper is effective for training momentary peak grip strength, but the endurance grip needed to hold on while moving weight over time is a separate ability. Since endurance grip gets used far more often in daily life — moving belongings, holding a bag for a while — training both together is the ideal approach.

"Core exercises are fine to do every day"

→ The quadratus lumborum and obliques stimulated by a carry need recovery time just like any other muscle. Especially at a higher-intensity stage like the offset carry, training around 3 times a week with recovery in between tends to build strength more effectively than doing it daily.

"If one side is weaker, just train that side more"

→ It's tempting to focus extra training on the weaker side, but a suitcase carry needs to be trained on both sides for an equal number of reps and distance. Repeating only one side builds anti-lateral flexion capacity in that direction while the opposite direction falls relatively behind, which can actually widen the left-right imbalance.