Kroc Row: How to Do It, Rep Ranges and Why It Builds a Big Back

A Kroc row is a single-arm dumbbell row done with a very heavy dumbbell for high reps, typically one hard set of 20 to 40, with a small amount of controlled body English to keep the weight moving. It's named after powerlifter Matt Kroczaleski, who used it to build the upper back and grip that heavy deadlifts and squats demand. Done well, it packs a lot of back, grip and mental toughness into a few minutes. Done badly, it turns into a torso-jerking mess that trains very little. Here's how to get it right.

How to do a Kroc row

You need one heavy dumbbell and something solid to brace your free hand on: a flat bench, a dumbbell rack or a power rack upright all work. Most people find a staggered stance with both feet on the floor gives them more room to row heavy than the knee-on-bench setup used for a strict dumbbell row.

1. Set your stance. Stand side-on to the bench with your feet staggered. If the dumbbell is in your right hand, your left foot goes forward and your right foot back. Plant your left hand on the bench with your arm straight.
2. Hinge and flatten your back. Push your hips back until your torso is somewhere between 30 and 45 degrees above parallel. That's more upright than a strict row, and it's what lets you handle the extra weight. Keep your lower back flat and your neck in line.
3. Grip it and let it hang. Hold the dumbbell with a neutral grip, arm fully straight, and let your shoulder blade drift forward so your lat is stretched. That stretch is the start of every rep.
4. Row hard to your hip. Drive your elbow back and up towards your hip, pulling the dumbbell to the side of your ribs. A small push from your legs and hips to start the weight is fine; your back still has to finish the rep.
5. Lower all the way. Let the dumbbell travel back down to a full stretch. Don't let it crash, but you don't need a slow tempo either. Keep a steady rhythm and keep going until you can't reach your ribs any more.
6. Swap sides. Finish one arm, rest briefly, then do the same number of reps (or try to) on the other.

Body English: controlled drive versus sloppy cheating

This is the part most people get wrong. A Kroc row isn't a strict row, but it isn't a free-for-all either.

Controlled body English means a small, deliberate rise of the torso (a few degrees, no more) and a little drive from the hips to get a heavy dumbbell off the dead stop. The dumbbell still moves from a fully straight arm to your hip on every rep. Your shoulders stay roughly square, and your back stays flat throughout.

Sloppy cheating looks like this: the torso bobs up and down like a pump handle, the shoulders twist open, the dumbbell moves 20cm and stops at your belly button, and the lower back rounds under the strain. At that point your hips and spine are doing the work, and your lats are along for the ride.

A useful check is to film a set from the side. If your chest rises more than the dumbbell does, take 5kg to 10kg off and try again. As fatigue builds, a little more body English creeps in on the final reps, and that's expected. It shouldn't start on rep one.

Rep ranges and how heavy to go

The defining feature of the Kroc row is the rep count. The classic target is 20 or more reps per set, often running into the 30s or 40s for advanced lifters.

Picking the weight takes a bit of trial and error. As a starting point:

• First attempt: use a dumbbell roughly 1.5 to 2 times what you'd use for 10 strict reps, and aim for 20.
• Under 20 reps: too heavy. Drop next session.
• Over 40 reps: too light. Go up one or two increments.

High reps with a heavy-ish load is a perfectly good way to build muscle. In a study of trained men, sets of 25 to 35 reps taken to failure produced similar muscle growth to sets of 8 to 12, although the heavier sets built more maximal strength (Schoenfeld et al., 2015). A later meta-analysis of 21 studies came to the same conclusion: hypertrophy was similar across light and heavy loads when sets went to failure, while 1RM strength favoured heavier loads (Schoenfeld et al., 2017). The Kroc row sits in the middle: heavy enough to feel brutal, with enough reps to rack up a lot of work in one set.

Most home lifters hit a ceiling with their dumbbells long before their back runs out of room to grow. If that's you, a heavier set of adjustable dumbbells is the obvious upgrade, because Kroc rows eat through weight quickly.

Grip and straps

Holding a heavy dumbbell for 30 reps is as much a grip test as a back test, and that's partly the point. Strapless Kroc rows build crushing grip and forearm endurance that carries straight over to deadlifts and carries.

The trade-off is that your grip often fails before your back does. If you're stopping the set because the dumbbell is sliding out of your hand, not because you can't pull it any more, your lats aren't getting the full stimulus.

A sensible approach:

• Grip is the goal: go strapless, and use chalk if your gym allows it.
• Back is the goal: use straps once grip becomes the limiting factor. Lasso straps are quick to set up between arms; our guide on how to use lifting straps covers wrapping a dumbbell handle properly.
• Both: do your first set strapless, then strap up for a back-off set.

If you don't own a pair yet, we've rounded up the best lifting straps in the UK.

Muscles worked

• Lats. The main mover. The deep stretch at the bottom and the pull towards the hip both load the lats hard, which is where most of the "wide back" growth comes from.
• Mid and upper back. Your rhomboids, mid-traps and upper traps work to pull the shoulder blade back and stabilise it under heavy load. The slightly more upright torso of a Kroc row brings in more trap than a strict row.
• Rear delts. They assist in pulling the upper arm back, especially as the elbow passes your torso.
• Biceps, forearms and grip. Your elbow flexors help on every rep, and your forearms take a real beating from holding the dumbbell for a long set.
• Core and lower back. With both feet on the floor and one hand braced, your trunk has to resist twisting and keep your spine flat for the whole set.

Benefits

More upper-back muscle. Heavy load plus high reps means a lot of total work for the lats and traps in very little time. One set per arm can be more productive than three or four casual ones.

Grip strength. Few exercises train grip endurance this hard without being a grip-specific drill. Lifters who struggle to hold onto heavy deadlifts often find Kroc rows help.

Fixes side-to-side imbalances. Training one arm at a time means your stronger side can't cover for the weaker one. If your left arm stops at 22 reps and your right at 30, you know where the work needs to go.

Efficient for home training. You need one dumbbell and a bench. That's it. For a home setup, it's one of the best ways to get a lot of back training from limited kit. The NHS recommends muscle-strengthening work for all major muscle groups on at least two days a week, and a weekly Kroc row covers the back end of that nicely.

Common mistakes

Cutting the range short. The most common fault by a distance. Once the dumbbell stops reaching the hip or stops getting a full stretch at the bottom, you're doing partial reps with a heavy weight, and the set no longer counts as a Kroc row.

Rounding the lower back. A heavy dumbbell will try to pull your spine into flexion. Brace before each rep and stop the set if you can't keep your back flat.

Twisting the torso open. Rotating your chest towards the ceiling to "help" the dumbbell up shifts the work away from your lat. Keep both shoulders pointing roughly at the floor.

Going too heavy on day one. Ego loading usually ends in 12 ugly reps. Start conservatively and earn the heavier dumbbells by beating your rep count.

Doing them too often. A true Kroc row set is very fatiguing. Hitting them three times a week rarely works; once a week with full effort beats several half-hearted attempts.

Variations

• Strict heavy dumbbell row. Same setup, no body English, sets of 8 to 12. A good stepping stone to Kroc rows and a useful second back exercise on another day.
• Meadows row. A landmine-based single-arm row with a thick sleeve and a staggered stance. It hits the upper back and rear delts from a slightly different angle. See our Meadows row guide.
• Seal row. Lying face down on a raised bench removes all body English and puts the focus fully on the back. It's almost the opposite of a Kroc row, which makes it a smart pairing. Read the seal row guide.
• Pendlay row. A strict barbell row from a dead stop on the floor each rep. It builds explosive pulling strength and teaches a flat-backed hinge. Our Pendlay row guide covers the setup.
• Rack-supported Kroc row. Bracing your free hand on a power rack upright rather than a bench lets you stand more upright and row even heavier. Handy if your bench is too low.

Kroc row vs standard dumbbell row

	Kroc row	Standard dumbbell row
Load	Very heavy for the reps	Moderate
Reps	20 to 40	8 to 15
Sets	1 to 2 per arm	3 to 4 per arm
Body English	Small, controlled	None
Stance	Both feet down, staggered	Usually knee and hand on bench
Torso angle	30 to 45 degrees	Close to parallel
Grip demand	Very high	Moderate
Best for	Back size, grip, work capacity	Learning the pattern, strict back work

The standard row is the better teaching tool and the safer default for beginners. The Kroc row is a higher-effort, lower-volume tool for lifters who already row with good form and want more from each set.

How to program Kroc rows

A simple, proven approach is one or two sets per arm, once a week, near the end of an upper-body or back session.

• Week 1: pick your weight, do one set per arm to near failure. Write down the weight and reps.
• Following weeks: try to beat the rep count by one or two.
• When you hit 35 to 40 reps: move up to the next dumbbell and expect the reps to drop back into the 20s.

If you want a little more volume, add a lighter back-off set of 15 to 20 reps after the main set. Pair them with a strict, lower-rep row elsewhere in the week (Pendlay rows or seal rows work well) so you're covering both heavy strength work and high-rep volume. For more ideas on rounding out your pulling, our list of back exercises is a good place to look.

Recommended reads

1. Dumbbell row: how to do it and form tips
2. Meadows row: how to do it and muscles worked
3. How to use lifting straps
4. The best adjustable dumbbells in the UK
5. More workout guides