What most people call the “upper bicep” is actually the long head of the biceps, the outer portion of the muscle responsible for that rounded peak when you flex. You can emphasize it by choosing exercises that place your arm behind your torso or use a narrow grip, both of which increase tension on the long head specifically. While you can’t completely isolate one head from the other, the right exercise selection makes a real difference in where the growth shows up.
Why Arm Position Matters
Your biceps has two heads: the long head (outer side, responsible for the peak) and the short head (inner side, responsible for width). Both heads work during every curl, but you can shift emphasis toward one or the other by changing your arm position relative to your torso.
The long head crosses both the elbow and the shoulder joint, which means it gets stretched more when your arm is behind your body. Research on biceps activation during shoulder exercises found the highest biceps activity during elbow flexion from an extended position, meaning when the arm starts behind the torso. That extra stretch at the start of the movement forces the long head to work harder through the full range of motion. Exercises that pull your elbows back or use a close grip take advantage of this principle.
Best Exercises for the Bicep Peak
Incline Dumbbell Curls
Set an adjustable bench to 45 to 60 degrees and sit back with a dumbbell in each hand, arms hanging straight down. From this position your arms are already behind your torso, putting the long head under a deep stretch before you even start curling. A 45-degree angle maximizes that stretch, while 60 degrees reduces it slightly but feels more comfortable on the shoulders. Curl the weights up with your palms facing forward, keeping your upper arms stationary against the bench. Lower slowly to get the full benefit of the stretched position.
Barbell Drag Curls
Stand holding a barbell with a shoulder-width or slightly narrower grip. Instead of curling the bar away from your body like a standard curl, drag it straight up along your torso. The bar should nearly brush your shirt the entire way up. Your elbows will slide back behind you as the bar climbs, keeping the movement vertical and the tension locked onto the long head. This small change in bar path eliminates the shoulder involvement that creeps into regular curls. Your front delts stay quiet, and the biceps do all the work. Lower the bar along the same path, keeping it close to your body.
Close-Grip Barbell Curls
Grab a barbell with your hands inside shoulder width, roughly 6 to 8 inches apart. This narrow hand position rotates the emphasis toward the long head. Curl with controlled form, keeping your elbows pinned at your sides. The movement looks almost identical to a standard barbell curl, but the grip change shifts the workload meaningfully.
Hammer Curls
Hold dumbbells with a neutral grip (palms facing each other) and curl without rotating your wrists. This targets both the long head and the brachialis, a muscle that sits underneath the biceps and pushes it upward, contributing to the overall peak appearance. Seated versions reduce momentum and increase the challenge. You can also perform cross-body hammer curls, bringing each dumbbell toward the opposite shoulder, which increases the long head emphasis further.
How to Program These Exercises
You don’t need to overhaul your entire routine. Pick two or three of the exercises above and work them into your existing arm or pull days. A meta-analysis on training volume found that performing at least 10 sets per muscle group per week produced greater muscle growth than fewer sets, but recent evidence suggests capping volume at around 12 to 15 weekly sets per muscle group. Going beyond that can impair recovery without adding extra growth.
For each exercise, aim for 3 to 4 sets of 6 to 12 reps with 60 to 90 seconds of rest between sets. That repetition range sits squarely in the hypertrophy zone. Training your biceps twice per week, split across two sessions, is the most common approach among experienced lifters and aligns with current recommendations of roughly 40 to 70 total reps per session.
A practical split might look like this: on one pull day, do incline dumbbell curls and close-grip barbell curls (3 sets each). On your second pull day, do drag curls and hammer curls (3 sets each). That gives you 12 sets per week with variety in movement patterns, covering the long head from multiple angles.
Technique Mistakes That Limit Results
The most common error is letting your shoulders take over the curl. Any time your elbows drift forward in front of your torso, the front deltoid starts absorbing the load that should go to your biceps. This is exactly why drag curls are so effective: the backward elbow path makes it physically difficult for your shoulders to cheat. Apply the same principle to all your curls by keeping your upper arms fixed in place.
Swinging the weight up with momentum is the other major issue. If you need to rock your torso to complete a rep, the weight is too heavy. The long head responds best to controlled tension through the full range of motion, especially the stretched position at the bottom. Cutting reps short or bouncing out of the bottom robs you of the most productive part of the movement.
Protecting Your Biceps Tendon
Exercises that place the arm behind the body increase stress on the distal biceps tendon where it attaches near the elbow. This is a worthwhile tradeoff for muscle development, but it does require attention to form. One key finding: when the forearm is fully pronated (palms facing down), the space available for the biceps tendon at its insertion point is 48% less than when the forearm is fully supinated (palms facing up). That mechanical crowding can irritate the tendon over time.
For peak-focused training, stick with supinated (palms-up) or neutral (palms-facing) grip positions. Save reverse curls (palms-down) for forearm development rather than long head work. If you notice persistent pain or swelling near the inside of your elbow, scale back the volume and intensity before pushing through it.
Genetics Shape the Peak Too
How dramatic your bicep peak looks when you flex is partly determined by the length of your muscle belly. People with shorter muscle bellies have a longer tendon and a higher, more pronounced peak. People with longer muscle bellies have a fuller but flatter appearance when flexed. You can’t change your insertion points, but you can maximize whatever genetic blueprint you have by building as much long head mass as possible. A shorter muscle belly with targeted training can produce a striking peak, while a longer muscle belly will develop impressive overall arm size even if the peak isn’t as sharp.
Regardless of your genetics, consistent long head training with progressive overload will improve the shape and size of your upper bicep over time. The exercises above give you the tools. The results come from doing them regularly, with good form, at a challenging weight.