It’s common to see someone in the squat rack with a bar loaded with heavy weights, bending their knees just a few inches. Right? Whether it’s the bench press or bicep curls, those using partial repetitions — on purpose or by accident — are sometimes judged lazy or careless with their form.
While this might be accurate occasionally, the topic of range of motion in training isn’t as straightforward as it seems. You might miss their potential benefits if you dismiss these partial reps too quickly. Partial repetitions are an advanced training technique that might be the ticket to elevate your workouts and the solution when you hit a plateau.
What are partial repetitions in bodybuilding?
Partial repetitions, often referred to as “partial reps,” are an advanced training technique used in bodybuilding to perform exercises over a reduced range of motion. This involves lifting a weight only through a portion of the exercise’s full range, rather than completing a full repetition from the start to the end point. By strategically incorporating partial reps, bodybuilders can target specific weak points in a muscle’s strength curve or further challenge muscles that have already been fatigued, ultimately contributing to muscle hypertrophy and strength gains.
It’s easier to handle heavier weight when doing only the first quarter of a rep, such as coming down just a few inches on the squat. Called a “partial rep”, this isn’t necessarily cheating. When you use very heavy weights for a partial, you stimulate your central nervous system to recruit more muscle fibers. This then “convinces” your body that you’re actually stronger, and you’ll find that you can handle heavier weights when you go back to using a full range of motion.
What is range of motion (ROM) and why does it matter?
Before we discuss partial repetitions in detail, we need to define the range of motion.
The range of motion (ROM) refers to the movement extent a joint can achieve while performing an exercise. It’s crucial because it influences how completely a muscle is worked, with varying amounts contributing to different training adaptations.
Full Range of Motion: This involves moving a joint from the farthest point of extension to the furthest point of flexion, fully engaging the muscles involved in the exercise. For example, in a full ROM squat, you would descend until your thighs are at least parallell to the floor, then rise back to standing. Bench pressing also exemplifies full ROM when you lower the barbell to your chest and press it upward until your arms are fully extended.
Partial Range of Motion: In contrast, partial range of motion limits the exercise to a portion of the complete movement. For instance, performing a bicep curl might involve lifting the weight only halfway up and down, focusing on a specific section of the lift. Similarly, in partial squats, the descent may only be to a quarter or halfway point, intensifying effort on a particular range.
What is the logic (rationale) behind partial reps?
The rationale behind partial reps is rooted in their ability to target specific portions of a lift, thereby enhancing your overall lifting technique and breaking through performance plateaus. By focusing on a segment of the movement, partial reps allow for greater weight lifting than in full reps. This targeted approach can improve strength at crucial sticking points where you might typically struggle.
One of the primary physiological mechanisms behind partial reps is manipulating the length-tension relationship in muscles. Muscles generate different levels of force depending on their length during contraction. By performing partial reps, bodybuilders can focus on the range where the muscle can generate the most force, potentially leading to increased strength and hypertrophy in that specific range.
Partial reps can also lead to increased time under tension, a crucial muscle growth factor.
Consequently, by practicing partial reps, you effectively strengthen those muscle groups that may hinder your performance in a complete range of motion. This strategic method also vitally provides muscles with the necessary mechanical force for growth, which results in more pronounced hypertrophy over time.
Examples of using partial reps
- Performing the top half of a bicep curl to focus on peak contraction.
- Using partial reps in bench presses by lowering the bar only halfway to target tricep strength.
- Executing the upper portion of a chin-up to enhance bicep engagement.
- Halfway hack squats to concentrate on quad development.
- Reducing the range in shoulder presses, focusing on the top half to increase deltoid strength.
- Performing knee-height deadlifts to hone in on locking out power.
- Stopping a calf raise halfway up to increase time under tension on the muscle.
- Executing the lower half of an incline bench press to work on chest activation.
- Using reduced range in barbell rows to develop specific back muscle sections.
- Incorporating only the lower portion of leg curls to target the hamstrings.
The method for incorporating partial reps effectively hinges on the specific exercise. Each movement presents its own resistance curve, with varying points of maximal challenge during the range of motion.
Two ways of doing partial reps
Partial reps can be performed in one of two ways:
- Partial Reps from Pins – A bar is placed at the midway point of the lift using pins (generally in a rack, and for exercises such as squats and bench press). The lifter positions himself and lifts the bar from the pins into a fully extended or contracted position;
- Partial Reps from Contraction – For exercises such as squats and bench press, the lifter unracks the weight normally, and proceeds to perform only a half or quarter rep.
What are the benefits of partial repetitions?
Let’s analyze some of the key benefits of incorporating partial reps into your routine:
- Targeting Sticking Points: Partial reps allow you to focus on and improve specific weak areas in your lifts, helping you overcome the sticking points that often hold back progress.
- Enhanced Neuromuscular Efficiency: By practicing partial reps, you can bolster your neuromuscular network, making movements smoother and more efficient.
- Increased Intensity: Incorporating partial reps can increase workout intensity, especially useful when you’re nearing fatigue yet wanting to push further.
- Heavier Lifting Potential: Because you are working through a limited range, partial reps let you safely handle heavier weights, which can boost your overall strength gains.
- Focused Muscle Activation: Partial reps enable a concentrated effort on specific muscle groups or parts of the lift, refining technique and potentially accelerating muscle growth.
- Plateau Busting: If you’ve hit a plateau in your training, partial reps can be a powerful tool to break through this barrier, offering a fresh stimulus to encourage further development.
What are the drawbacks of partial repetitions?
While partial repetitions can be a valuable tool in your training arsenal, they come with drawbacks that shouldn’t be overlooked. Here are some potential disadvantages you should be aware of:
- Limited Muscle Activation: Since partial reps do not involve the full range of motion, you’re not fully engaging all muscle fibers, which can lead to suboptimal muscle growth.
- Reduced Efficacy for General Strength Gains: While effective for strengthening specific parts of a lift, partial reps aren’t as beneficial for improving overall strength, which typically requires full-range movements.
- Higher Risk of Developing Muscle Imbalances: Reliance on partial reps may cause imbalances, especially if certain muscles are consistently under-activated compared to others.
- Potential Form Degradation: By not practicing the full range of a movement, your form may suffer, increasing the likelihood of injury.
- Misleading Perception of Progress: Partial reps can make it seem like you’re lifting heavier weights when, in reality, you’re only moving them through a portion of their range.
Pros
Cons
How do partial reps impact muscle hypertrophy compared to full reps?
Regarding muscle hypertrophy, the debate between partial reps and full reps is vibrant. Partial reps allow you to lift heavier weights, and this can lead to muscle engagement at a different intensity level. However, full reps typically involve a greater range of motion, engaging the muscle more thoroughly across its length. This often results in more significant muscle growth and strength gains as compared to partial reps.
Scientific studies suggest that while both partial and full reps increase muscle thickness, full reps consistently deliver more substantial results. The rationale is that full range movements optimize stretch under tension and facilitate better muscle activation patterns, crucial factors in hypertrophy. Since partial reps do not engage the muscle through its full range of motion, they might not stimulate as many muscle fibers, potentially limiting overall hypertrophy. That said, incorporating partial reps strategically can still enhance gains through mechanical overload or address specific sticking points in your lifts.
In essence, for pure muscle hypertrophy (bigger muscles), full reps tend to be far more beneficial due to their comprehensive engagement of muscle fibers. However, sporadically utilizing partial reps in conjunction with full reps can enhance your training by adding variety and targeting specific areas of strength or development. Relying solely on partical reps is a bad idea!
The importance of partial reps in Olympic weightlifting, powerlifting, and strongman programs
Partial range of motion training is a staple in powerlifting, weightlifting, and strongman routines to improve weaker areas within a lift’s movement.
Olympic lifts, marked by their fluidity and artistry, as well as exercises like the bench press and deadlift, involve several complex components. These intricacies mean that any mistakes or power leaks can hinder your performance significantly.
Using partial reps allows you to concentrate on the sections of a lift where you struggle most. For instance, if you’re finding it tough to lock out during deadlifts, performing pulls from low blocks can help you overload the movement and practice effectively where it counts. Similarly, snatch deadlifts or pulls enable athletes to perfect their technique in the initial phase without the stress of catching the barbell.
This is why the context of range of motion is key, highlighting partial reps’ effectiveness.
How often should partial repetitions be included in a workout routine?
Moderation is key when it comes to weaving partial repetitions into your workout routine. It’s vital to incorporate them thoughtfully to avoid overtraining while still reaping their benefits. Many fitness experts suggest incorporating partial reps once or twice a week depending on your fitness goals and the specific lifts you’re working on. They can be handy for targeting particular strength-building goals or breaking through stubborn plateaus in your training.
Additionally, if you’re adding partial reps to your routine, consider cycling them in periods—such as a few weeks on, followed by a few weeks off—to give your body time to recover and adapt. Rather than using them in every training session, aim for a strategic approach based on your fitness level, workout intensity, and overall program goals. By balancing full and partial reps effectively, you can enjoy a comprehensive workout plan that supports muscle growth and strength improvements.
Our suggestion: Perform partial reps at the end of a regular set of an exercise. Let’s say you can manage only 10 reps of a barbell curl. Instead of stopping the set at the 10th rep, you bring the bar to the top and squeeze out a few more. You may be able to curl the weight only six to eight inches, but that’s fine. You’re still hitting muscle fibers you wouldn’t have been hitting had you stopped the set after the last full rep.
Partial Reps vs. “Cheating”
When it comes to the debate over partial reps and “cheating” in strength training, there is often a fine line drawn between them. The distinction largely hinges on the intent and execution of the movement. Partial reps are deliberately utilized to target specific muscles or work through sticking points where a lifter may struggle to move the weight through the entire range of motion. The aim is controlled training, focusing effort on an intended outcome, whether it be strength gains, power improvements, or muscle hypertrophy.
On the other hand, “cheating” typically refers to unintentional or uncontrolled modifications made to a lift’s form, often out of fatigue or in an attempt to increase the weights lifted deceitfully. Cheating can involve the use of momentum or compromising form in ways that detract from the exercise’s effectiveness and increase the risk of injury. While partial reps are a strategic training method, “cheating” is often viewed as a negative practice that should be avoided to maintain the integrity of a workout and ensure true progression.
Are partial reps suitable for beginners?
Partial reps can be a thrilling tool when thoughtfully integrated into a training regimen, but they are generally not recommended for most beginners. At the start of your strength training journey, the focus should be on mastering a full range of motion exercises to build a solid foundation in technique and muscle balance. If you’re a relative beginner to resistance training, you should follow that rule. By first perfecting full reps, beginners will ensure overall muscle development and reduce the risk of injury.
As a beginner, sticking to full range workouts can help you achieve those initial “newbie gains” effectively. Once you’ve built a stable baseline of strength and form, you might consider exploring partial reps as a means to target specific weak points or plateaus in your training routine. Until then, focus on achieving consistency and competence in full reps to set the stage for more advanced techniques later on.
Closing thoughts
Executing exercises with a full range of motion should be the foundation of your workouts. While partial reps have their role, full repetitions typically offer greater benefits, even if it means using lighter weights or performing fewer reps.
