If you want thicker arms, regular biceps curls are not your only option. They can work well, but many people find them repetitive, uncomfortable on the wrists, or simply less enjoyable than other training options. More importantly, a bigger arm is not built by the biceps alone.
The triceps make up a large proportion of the muscle mass of the upper arm. The brachialis, which sits beneath the biceps, can also make the arm look thicker from the front and side. Your brachioradialis, the prominent muscle on the upper forearm near the elbow, adds to the dense and athletic look of a well developed arm.
That means your best strategy is not to hunt for a magical biceps exercise. It is to choose movements that train elbow flexion, elbow extension, and grip with enough effort and consistency to drive muscle growth. The three exercises below do exactly that without asking you to perform a standard supinated dumbbell or barbell curl.
Why Thicker Arms Require More Than Biceps Training
The biceps brachii has two main roles at the elbow and forearm. It helps bend the elbow and rotate the palm upward. However, it is not the only muscle that bends the elbow. The brachialis is a powerful elbow flexor that works regardless of whether your palm faces up, down, or inward. Because it lies underneath the biceps, increasing its size can push the biceps outward and make the upper arm appear thicker.
The brachioradialis also bends the elbow, particularly effectively when the hand is in a neutral position with the thumb facing upward. This muscle crosses the elbow but sits largely in the forearm, so developing it can make the entire arm look more substantial rather than leaving a sharp visual drop between the upper arm and forearm.
Then there are the triceps. The triceps brachii straightens the elbow and contains three heads. The long head is particularly important for arm size because it crosses both the shoulder and elbow joints. Training the triceps hard is essential if your goal is fuller looking arms rather than just a visible biceps peak.
Research consistently shows that resistance training can increase muscle size when enough challenging work is performed over time. A wide range of loads can build muscle effectively when sets are taken close enough to muscular failure, while doing more productive weekly sets generally creates greater hypertrophy up to the point where recovery becomes a limiting factor. Exercise selection matters because it determines which muscles are challenged and how comfortably you can train them hard.
1. Neutral Grip Chin Ups
Neutral grip chin ups are one of the best compound exercises for thicker arms because they train the biceps, brachialis, brachioradialis, upper back, and grip in one movement. You perform them using parallel handles, with your palms facing each other.
Unlike a regular curl, a chin up asks your elbow flexors to move a meaningful portion of your body weight. This makes it an efficient choice for people who want stronger and more muscular arms while also building the back.
Why Neutral Grip Chin Ups Build Arm Thickness
During a chin up, the elbow flexors work hard to pull your body upward. Research comparing several pull up variations found substantial activation of the biceps brachii and brachioradialis throughout the movement. The upward phase produced greater average activation in these muscles than the lowering phase, although both parts of the repetition contribute useful tension.
The neutral hand position is especially useful for people who dislike standard curls. It gives the brachioradialis and brachialis a strong role while avoiding the fully supinated grip used in a classic dumbbell curl. Many lifters also find neutral handles more comfortable for the wrists, elbows, and shoulders.
This exercise also allows progressive overload. You can begin with an assisted machine, resistance band assistance, or controlled negative repetitions. As you improve, you can add repetitions, slow the lowering phase, reduce assistance, or eventually attach extra weight to a belt.
How to Perform Them
Start by gripping the parallel handles firmly and hanging with your body under control. Keep your ribs down and avoid swinging your legs to create momentum. Pull your elbows down toward your sides as you lift your chest toward the handles.
At the top, aim to bring your chin level with or slightly above the hands without aggressively craning your neck. Lower yourself under control until your elbows are straight and your shoulders are in a stable position. A full range of motion gives the elbow flexors a meaningful stretch and keeps the exercise honest.
If you cannot yet do bodyweight repetitions, use an assisted option that allows you to complete controlled repetitions. Build toward three or four sets of six to twelve challenging reps. Once you can comfortably exceed that range, make the exercise harder rather than endlessly adding repetitions.
Common Mistakes to Avoid
The most common mistake is using momentum. Kipping, swinging, and incomplete repetitions reduce the tension on the muscles you want to grow. Another mistake is stopping every set far from fatigue because bodyweight movements feel intimidating. You do not need to grind ugly repetitions, but your working sets should be demanding enough that you could complete only a few more reps with solid form.
2. Hammer Curls
Hammer curls are still a curling movement, but they are not regular biceps curls. Instead of holding the weight with your palms facing upward, you use a neutral grip with the thumbs pointing toward the ceiling.
This small change shifts the emphasis. The biceps still contribute, but the brachialis and brachioradialis receive more attention than they typically do in a conventional supinated curl. That makes hammer curls one of the most direct tools for making the arms look denser and thicker.
Why Hammer Curls Work
The brachialis is often overlooked because it is not as visible as the biceps. Yet it is a major elbow flexor, and its position beneath the biceps means it can add noticeable upper arm thickness. Hammer curls are a practical way to train it while also loading the brachioradialis.
Research comparing curl variations found that changing hand position altered the relative activity of the biceps brachii and brachioradialis. This supports the practical reason for including more than one style of elbow flexion in an arm training plan. You do not need to abandon the biceps, but using a neutral grip can help you develop muscles that regular curls may not emphasize as strongly.
Hammer curls also have a simple advantage: they are easy to load and progress. Dumbbells, cables, resistance bands, and a rope attachment can all work. The best option is the one you can perform with a controlled range of motion and without turning the movement into a swing.
How to Perform Them
Stand tall with a dumbbell in each hand and your palms facing inward. Begin with your arms straight but not aggressively locked. Keep your elbows close to your sides and curl the dumbbells upward until your forearms are close to vertical.
Pause briefly at the top, then lower the weights slowly until the elbows are straight again. Keep your torso still. If your shoulders are rocking backward or your elbows are drifting far forward, the weight is probably too heavy for the target muscles to do their job.
Three to five sets of eight to fifteen repetitions work well for most people. Select a load that lets you control the lowering phase and approach fatigue within that range. You can perform hammer curls with both arms together, one arm at a time, or on an incline bench if you want to reduce the chance of cheating.
Common Mistakes to Avoid
Do not let the dumbbells drift so far forward that the exercise becomes a front shoulder raise. Keep the elbows roughly beneath the shoulders. Avoid gripping the dumbbell so hard that your wrist bends backward or forward. A firm, neutral wrist allows force to transfer efficiently through the forearm.
It is also worth avoiding the urge to use very heavy weights with short, swinging reps. The goal is not merely to move dumbbells from one point to another. The goal is to create enough mechanical tension in the elbow flexors to stimulate adaptation.
3. Overhead Triceps Extensions
If thicker arms are the goal, you should not neglect the triceps. The overhead triceps extension is particularly effective because placing the arm overhead changes the position of the long head of the triceps.
You can do this exercise with a cable and rope attachment, one dumbbell held with both hands, two dumbbells, or an overhead machine. For many people, the cable version is easiest to control because it provides resistance throughout the movement.
Why Overhead Extensions Are So Effective
The long head of the triceps crosses the shoulder joint, unlike the lateral and medial heads. Raising the arm overhead lengthens this muscle before it performs elbow extension. Training muscles at longer lengths can be useful for hypertrophy, and a controlled trial directly comparing overhead and neutral arm triceps extension training found greater triceps growth after the overhead variation.
That finding does not mean every other triceps exercise is ineffective. Pressdowns, close grip presses, and dips can all contribute to stronger and larger triceps. However, the overhead extension deserves a place in an arm focused program because it gives the long head a distinct challenge that many pressing movements do not fully replicate.
This matters visually. A well developed long head adds mass to the back and inner portion of the upper arm. When viewed from the side, it can make the arm look markedly thicker even when the biceps are relaxed.
How to Perform Them
Set a cable pulley low behind you if you are using a rope attachment. Face away from the machine, bring the rope overhead, and begin with your elbows bent and pointed generally forward. Keep your upper arms stable as you straighten the elbows and extend the hands upward.
At the top, fully contract the triceps without forcing the elbows into an uncomfortable lockout. Lower the rope slowly until you feel a stretch in the triceps, then begin the next repetition. Your torso should remain stable rather than arching backward to make the weight easier.
If you use a dumbbell, hold it securely above your head and lower it behind you by bending the elbows. Keep the elbows reasonably close together and use a weight you can lower with control. If shoulder mobility makes the position uncomfortable, try a cable variation, reduce the range slightly, or choose a different triceps movement.
Common Mistakes to Avoid
The biggest error is turning the exercise into a whole body movement. Excessive lower back arching and flared ribs reduce stability and can make the position less comfortable. Brace your midsection, keep your ribs controlled, and allow the elbows to bend rather than trying to create range by moving your shoulders excessively.
Do not rush the bottom position. The stretched portion of the exercise is where the long head is challenged in its lengthened position. Use a smooth and controlled descent, then straighten the elbows with intent.
How to Build an Effective Thicker Arms Workout
You can use all three exercises in the same session twice per week. Start with neutral grip chin ups while you are fresh, then perform hammer curls and overhead triceps extensions afterward. This order lets you put quality effort into the compound movement without sacrificing the direct arm work that follows.
A practical starting point is three hard sets of neutral grip chin ups, three sets of hammer curls, and three sets of overhead triceps extensions. Choose loads and assistance levels that allow controlled reps while leaving only a small number of repetitions in reserve at the end of most working sets.
Progress does not need to be complicated. Try to add a repetition when your form is solid. Once you reach the top of your chosen repetition range on all sets, increase the load slightly or use less assistance. Record your performance so you can see whether you are actually improving over several weeks.
Nutrition and recovery matter too. Building muscle requires enough energy, sufficient protein, regular training, and time. You do not need to feel destroyed after every arm session, but you do need to give the muscles a reason to adapt.
The Bottom Line
You can build thicker arms without relying on regular biceps curls. Neutral grip chin ups train the biceps, brachialis, brachioradialis, grip, and back with a challenging compound movement. Hammer curls build the elbow flexors that create density around the upper arm and forearm. Overhead triceps extensions directly target the triceps long head, which is essential for fuller looking arms.
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Train these movements with controlled technique, enough effort, and a clear progression plan. Over time, that combination will do far more for your arm size than constantly changing exercises or chasing a quick pump.
Key Takeaways
| Exercise | Main Muscles Emphasized | Why It Helps Build Thicker Arms | Practical Starting Point |
|---|---|---|---|
| Neutral grip chin ups | Biceps, brachialis, brachioradialis, upper back | Loads the elbow flexors with body weight while also building grip and back strength | 3 to 4 sets of 6 to 12 challenging repetitions |
| Hammer curls | Brachialis, brachioradialis, biceps | Uses a neutral grip to develop muscles that add upper arm and forearm density | 3 to 5 sets of 8 to 15 controlled repetitions |
| Overhead triceps extensions | Triceps, especially the long head | Builds the large triceps muscle group and challenges the long head in a lengthened position | 3 to 4 sets of 10 to 15 controlled repetitions |
| Progression | All target muscles | More repetitions, load, or reduced assistance creates a reason for the muscles to adapt | Improve one variable when form remains solid |
References
- Dickie, J.A., Faulkner, J.A., Barnes, M.J. and Lark, S.D. (2017) ‘Electromyographic analysis of muscle activation during pull up variations’, Journal of Electromyography and Kinesiology, 32, pp. 30 to 36.
- Maeo, S., Yoshitake, Y., Takahashi, H. and Kanehisa, H. (2023) ‘Triceps brachii hypertrophy is substantially greater after elbow extension training performed in the overhead versus neutral arm position’, European Journal of Sport Science, 23(6), pp. 861 to 870.
- Schoenfeld, B.J., Grgic, J., Ogborn, D. and Krieger, J.W. (2017) ‘Strength and hypertrophy adaptations between low versus high load resistance training: A systematic review and meta analysis’, Journal of Strength and Conditioning Research, 31(12), pp. 3508 to 3523.
- Schoenfeld, B.J., Ogborn, D. and Krieger, J.W. (2017) ‘Dose response relationship between weekly resistance training volume and increases in muscle mass: A systematic review and meta analysis’, Journal of Sports Sciences, 35(11), pp. 1073 to 1082.
- Vigotsky, A.D., Halperin, I., Lehman, G.J., Trajano, G.S. and Vieira, T.M. (2018) ‘Interpreting signal amplitudes in surface electromyography studies in sport and rehabilitation sciences’, Frontiers in Physiology, 8, 985.
- Youdas, J.W., Haeflinger, K.M., Kreun, M.K., Holloway, A.M., Kramer, C.M. and Hollman, J.H. (2018) ‘Differences in electromyographic activity of biceps brachii and brachioradialis while performing three variants of curl’, Journal of Strength and Conditioning Research, 32(11), pp. 3181 to 3188.
