One-Arm Bent-Over Barbell Row: Strength Asymmetry

The one-arm bent-over barbell row is a single-arm back row. It's a variation of the bent-over row, using a single-arm load instead of the classic two-arm version. The exercise combines horizontal pulling and maintaining a bent-over torso, developing not only the latissimus dorsi and rhomboids but also core stabilizers, particularly the lumbar spine and glutes. Research on bent-over rows shows that these movements produce significant upper back activation and require good core control. [1]

Unlike the classic two-arm barbell row, the unilateral version allows for more targeted loading of each side of the back separately and the correction of muscle imbalances. Research on unilateral rows shows that such exercises effectively engage the lats, rhomboids, trapezius, rear deltoids, as well as the forearms and core stabilizers. This makes unilateral rows a convenient tool for equalizing strength on the right and left sides. [2]

When performed correctly, bent-over rows can improve posture and scapular control. Research on bent-over and inverted rows shows that these exercises develop the ability to maintain scapular retraction and retraction, which is important for preventing slouching and shoulder discomfort. Strengthening the rhomboids and mid-trapezius reduces pectoral dominance and helps balance the load on the shoulder joints. [3]

From a general fitness perspective, the one-arm bent-over barbell row can be a staple in both amateur and advanced back exercises. Strength training recommendations for healthy adults recommend training the major muscle groups at least twice a week, with multiple sets of eight to twelve repetitions per movement. The one-arm row easily fits into such routines as one of the horizontal row movements. [4]

It's important to be mindful of the risks to the lower back. Bent-over rows without core support are among the more challenging exercises for the lumbar spine, especially if technique is poor and the back rounds. Strength experts emphasize that any bent-over row should be performed with a strong hip flexion skill and a neutral spine. If your back extensors are weak and your core control is poor, it's best to start with easier variations, such as bench or machine-supported rows. [5]

Table 1. Basic tasks of the one-arm bent-over barbell row

Task	What does the exercise give?
Development of back muscles	Load on the latissimus dorsi, rhomboids, trapezius
Correction of muscle imbalances	Separate work of the right and left sides
Improving posture	Scapular adduction and retraction training
Development of body stabilizers	Maintaining a tilted position with a neutral lumbar spine
General strength training	Strengthening upper body pulling power

Biomechanics and working muscles

The one-arm bent-over barbell row is a multi-joint pulling exercise. The movement involves the shoulder joint, scapulothoracic complex, and elbow joint. Biomechanical analysis of one-arm rows shows that the primary movement occurs through shoulder extension and adduction of the shoulder toward the body with simultaneous scapular retraction, with elbow flexion playing a supporting role. [6]

The primary muscle involved in this exercise is the latissimus dorsi. It is responsible for adducting the shoulder toward the torso and partially extending the shoulder joint. The rhomboids and middle trapezius muscles provide adduction and stabilization of the scapula as the barbell is pulled toward the body. The posterior deltoids additionally assist in shoulder extension and maintaining proper trajectory. [7]

The elbow flexors, primarily the biceps brachii and brachioradialis, act synergistically to provide flexion at the elbow joint as the barbell is brought toward the body. The forearm and hand muscles are actively involved in holding the barbell, making the exercise useful for developing grip strength. The thicker the bar and the longer the sets, the greater the strain on the forearm muscles. [8]

The core muscles and back extensors play a special role. Research on bent-over rows shows that when bending the torso and supporting the weight, the lumbar extensors and pelvic girdle muscles take on significant load. This explains why, when these muscles are fatigued or weak, technique quickly falls apart, leading to a rounded lower back and excess stress on the discs and posterior vertebrae. [9]

The unilateral variation further strengthens the oblique abdominal muscles and deep core stabilizers. They prevent the torso from rotating toward the working arm and help maintain a horizontal pelvis. Thus, the one-arm bent-over barbell row is not only a back exercise but also a dynamic exercise for anti-rotational core stability. This makes it particularly useful for sports where core stability is important during unilateral exercises. [10]

Table 2. Main muscle groups involved in the exercise

Muscle group	Role in the exercise
Latissimus dorsi	Basic pulling movement of the shoulder to the body
Rhomboids and middle trapezoids	Scapular adduction and stabilization
Posterior deltoid muscle	Additional extension of the shoulder joint
Biceps brachii and forearm	Elbow bending and bar grip
Core muscles and back extensors	Stabilization of the trunk and lumbar region in a tilted position

Technique: from the starting position to the top point

Before beginning this exercise, it's important to master proper pelvic flexion. Modern strength training technique guides emphasize that when bending the torso, the primary movement should occur at the hip joints with a neutral spine. For training, a stick placed along the back and supported by the back of the head, thoracic region, and sacrum is often used to control the position. [11]

The starting position for a one-arm bent-over barbell row is typically as follows. Your feet are hip-width apart or slightly wider, with your knees slightly bent. Your torso is leaning forward by pushing your pelvis back, your back is straight, your chest is open, and your abdominal muscles are engaged. One hand holds the barbell with a neutral or pronated grip, while the other can rest on your thigh, a rack, a bench, or remain free for balance. Your weight is supported by the midfoot, not the toes. [12]

The movement begins with pulling the barbell toward the pelvis by drawing the shoulder toward the body and retracting the scapula from behind. It's important not to "tear" the barbell with your back, but to consciously initiate the movement from the scapula and shoulder joint. The elbow should be along the body or slightly to the side, but not too far back with excessive shoulder rotation. At the top, pause briefly, noticing tension in the lats and muscles between the shoulder blades. [13]

The lowering of the barbell is performed slowly and in a controlled manner, without dropping the weight. The scapula smoothly returns to a neutral position, and the shoulder is pulled forward and downward, but without excessive "hanging" on the ligaments. The eccentric phase is especially important for strengthening muscles and preventing injury, so the speed of lowering is usually slower than the speed of lifting. There should be no body swinging or sudden jerks. [14]

Breathing is guided by the principle of stabilization. Most often, a calm inhalation is used in the starting position and an exhalation during the barbell pull, then another inhalation during the controlled lowering. When working with moderate weights, this is sufficient to maintain stability. With heavier loads, experienced athletes use maneuvers with preliminary inhalation and straining to increase intra-abdominal pressure, but these are not recommended for beginners due to the increased stress on the cardiovascular system. [15]

Table 3. Brief algorithm for performing one-arm bent-over barbell rows

Stage	Key actions
Preparation	Master pelvic flexion with a neutral spine
Starting position	Feet hip-width apart, body bent over, back straight
Barbell curl	Pull using your shoulder blade and shoulder, elbow along the body
The highest point	A brief pause, a feeling of tension in the back
Lowering	Slow, controlled return to the starting position

Common mistakes and how to avoid them

One of the most common mistakes is rounding the lower back when bending. Instead of bending at the hips, a person "folds" the middle of the back, increasing shear stress on the discs and posterior structures of the spine. Biomechanical studies on injury prevention show that maintaining a neutral spine position significantly reduces the risk of injury during strength training. Therefore, before mastering the deadlift, it is essential to learn to maintain a neutral lumbar spine when bending. [16]

The second typical mistake is using excessive weight on the barbell, which results in the movement being performed through body jerks and inertia. This results in a loss of targeted load on the back muscles, increasing the risk of injury to the lower back and shoulder joints. Risk analyses for bent-over rows emphasize that this group of exercises is more prone to injury with improper technique and excessive weights, especially without proper core support. [17]

The third mistake involves the scapula. A common practice is "pulling with the arms," where the shoulder joint and elbow move, but the scapula barely engages. As a result, the biceps and shoulder joint bear the brunt of the load, while the back muscles receive less stimulation. Biomechanical analyses of unilateral pulls emphasize the importance of active scapular retraction and depression for proper lat and rhomboid muscle engagement. [18]

Another common problem is rotating the body and "twisting" the torso toward the working arm. This movement reduces the load on the target back muscles and increases the load on the lower back. To prevent this, it's important to consciously engage the core muscles, imagine that the torso should remain "frozen" relative to the pelvis, and allow only the arm and shoulder blade to move. In some cases, reducing the weight of the barbell and performing the exercise with additional support from the free arm helps. [19]

Finally, many people ignore the gradual increase in load. Strength training recommendations dictate that weight increases should only occur when a person confidently performs the prescribed number of repetitions with proper technique and reserve. A common guideline is: if, in two consecutive workouts, you can perform one or two more repetitions than the planned volume without deteriorating technique, you can add a small amount of weight. This reduces the risk of overtraining and allows for progress without sudden jumps. [20]

Table 4. Typical errors and how to correct them

Error	What is dangerous?	How to fix
Rounding of the lower back	Increased stress on discs and ligaments	Master pelvic flexion and lose weight
Body jerks and inertia	Loss of control, risk of injury	Reduce weight, slow down
"Arm pull" without shoulder blade work	Underuse of back muscles	Focus on bringing your shoulder blades together
Turning the body towards the working hand	Excessive strain on the lower back	Strengthen the core work, add support if necessary
Rapid weight gain without proper technique control	Overload of joints and tendons	Increase the load only if your technique is stable

Exercise variations and their place in the training program

The one-arm bent-over barbell row has several variations, differing in the degree of support and lower back strain. The most demanding version is performed standing without external support, with the free hand lightly touching the thigh or holding onto a bar. A more gentle variation involves supporting the lower back with one hand on a bench or bar, which partially relieves the lower back and allows for better core control. Those with severe back problems often choose the supported row or switch to machine exercises. [21]

Grip and trajectory variations are also possible. A neutral grip (palms facing toward the body) distributes the load more evenly between the lats and mid-back. A pronated grip (palms facing back) increases upper back and posterior deltoid involvement. Some athletes use a slight torso rotation and a trajectory toward the top of the hipbone to emphasize the lower lats, but these variations require good control and are not recommended for beginners. [22]

From a training planning perspective, the one-arm bent-over row is typically included on back or pulling day. Strength training recommendations for healthy adults suggest performing exercises for major muscle groups two to three times per week, with two to four sets of eight to twelve repetitions to develop strength and muscle mass. Beginners may benefit from starting with fewer sets and moderate weights, focusing on technique. [23]

Unilateral rows are conveniently combined with bilateral exercises, such as lat pulldowns, pull-ups, and inverted rows. Research on various rows shows that different variations load the lats, upper back, and hip extensors differently, so combining them provides a more complete workout. For example, inverted rows provide high lat activation with less lower back stress, while standing bent-over rows require more core stabilizer work. [24]

When designing a program, it's important to consider the total volume of pulling work per week. Excessive heavy bent-over rows can overload the lower back and lead to fatigue. In such cases, it's reasonable to shift some of the volume to chest-supported exercises, machine exercises, or inverted rows, leaving the single-arm barbell row as a key, but not the only, option. This is consistent with the principle of progressive load while maintaining a reasonable balance between stimulus and recovery. [25]

Table 5. Examples of incorporating one-arm deadlifts into the program

Level of training	Example of using the exercise
Newbie	2 sets of 8-10 reps per arm, once a week
Intermediate level	3 sets of 8-12 reps, 1-2 times a week
Advanced	3-4 heavy sets on back day, plus lighter pulls on the other day
For a sensitive lower back	Bench supported version, moderate weight
With a large volume of thrust	Alternating inverted rows and rows on the machine

Safety, contraindications and alternatives

Despite its high effectiveness, the one-arm bent-over barbell row is an exercise with increased demands on technique and stabilizer strength. Publications on lumbar injury prevention emphasize that maintaining a neutral spine and proper hip flexion remain universal recommendations for most strength exercises. If it is impossible to stabilize the back while bent over, using the free row may be premature. [26]

People with existing low back problems, such as severe herniated discs, spinal stenosis, recent injuries, or surgeries, should discuss exercise selection with their physician and a physical therapist. For these individuals, chest-supported machine pulls, seated rows, or inverted rows are often preferred, as research has shown that these exercises place less stress on the lumbar spine while providing comparable back muscle activation. [27]

If you experience sharp, shooting pain, numbness, weakness, or instability in your leg while performing a bent-over row, stop the exercise immediately. These symptoms may indicate nerve irritation and require medical evaluation. Continuing to perform strength training under these conditions can worsen the problem. If you experience mild muscle discomfort, it's best to reduce the weight, shorten the range of motion, and review your technique under the guidance of a specialist. [28]

For many exercisers, using alternatives is a suitable compromise. Analysis of various rows has shown that the inverted row provides high activation of the lats and upper back muscles with less stress on the lower back compared to the classic bent-over row. Machine rows with chest support and seated rows with platform support are also better suited for those with increased lower back sensitivity, as they reduce the need to maintain a bent-over position. [29]

Ultimately, the one-arm bent-over barbell row can be a powerful tool for developing back strength and core stabilizers, but it requires respectful technique and an honest assessment of one's abilities. With good core control, gradual progression, and a reasonable volume, this exercise can strengthen your back, improve posture, and improve pulling strength. If you have any concerns about safety, it's best to start with gentler variations and consult a trainer or doctor to determine the optimal exercise program. [30]

Table 6. When to replace the one-arm bent-over row

Situation	Reason for caution	Possible alternative
Acute or recent back injury	High load on the lower back	Seated row, lat pulldown, chest-supported machine
Marked increase in pain when bending	Possible deterioration of the condition	Inverted rows, lying exercises
Poor body control	Risk of rounding the back and injury	Working on hip flexion, simpler row variations
Very high training volume	Lumbar strain	Part of the volume is transferred to exercise machines
Lack of access to a trainer for a newcomer	High demands on technology	It's easier to master the one-arm dumbbell row with support