Incline Dumbbell Curl

Set a bench to a 45-60 degree incline and sit back with a dumbbell in each hand, arms hanging straight down. Curl both dumbbells up toward your shoulders while keeping your upper arms stationary and against the bench. Lower with control to full arm extension, letting the weight stretch your biceps at the bottom.

Pro Tips

• The incline position puts your arms behind your torso, stretching the long head of the biceps
• Do not swing your elbows forward to help the weight up — the bench angle is the challenge
• Use lighter weight than you think; the stretched position makes this significantly harder

Muscles worked

Primary: Biceps brachii — specifically the long head, which is placed in a fully lengthened position when the arm hangs behind the torso at the incline. The long head originates from the supraglenoid tubercle of the scapula; when the shoulder is extended behind the body (as it is in the incline position), the long head is stretched across both the shoulder and elbow joints simultaneously, creating a loading pattern unique to this variation.

Supporting: Brachialis (deep elbow flexor, active throughout), brachioradialis (forearm, active in the supinated-to-neutral transition), forearm flexors (wrist stabilisation).

Common mistakes

Swinging the elbows forward: The entire point of the incline bench is to lock the shoulder in extension and isolate the bicep curl without any shoulder flexion. Swinging the elbows forward to help complete the curl removes the long-head stretch position and turns this into a standard dumbbell curl. The upper arms must stay vertical and behind the torso throughout.

Bench angle too steep: A near-vertical incline (70+ degrees) reduces the arm extension behind the body and minimises the distinctive stretch of this variation. A 45–60 degree incline is the sweet spot — steep enough for back support, low enough to extend the arm meaningfully behind the torso.

Loading the same as a standard curl: The stretched position under the incline makes this variation significantly harder in the bottom range. Using the same weight as a standard dumbbell curl almost always results in form breakdown. Reduce the weight by 20–30 percent.

Programming notes

The incline dumbbell curl is a specialised bicep exercise primarily used in hypertrophy programmes targeting long-head bicep development — the head responsible for the “peak” appearance of the flexed bicep. It is best used as a complementary exercise alongside a standard or supinated-grip curl, not as a replacement.

Typical programming: 3–4 sets of 10–12 repetitions at the end of a pull or arm session. Because of the loaded stretch, a slower eccentric (2–3 seconds lowering) is particularly effective for maximising the stimulus in the most productive position — the stretched bottom.

Frequently asked questions

What angle should the bench be set to for incline dumbbell curls?

Set the bench between 45 and 60 degrees. This range extends your arms far enough behind your torso to put the long head of the biceps under a genuine stretch without putting excessive stress on the shoulder. Angles steeper than 60–65 degrees reduce that extension and make the exercise closer to a standard seated curl. Angles shallower than 45 degrees can strain the shoulder joint at the bottom of the rep.

Why is the incline dumbbell curl harder than a regular dumbbell curl with the same weight?

The incline position loads the biceps in the stretched position — the point where the muscle is longest and mechanically weakest. Standard curls are hardest at 90 degrees of elbow flexion, where leverage is worst; the bottom range is relatively easy. With the incline curl, that stretched bottom is the hardest part of every rep. You are fighting the load throughout the full range, which is why you will need to drop 20–30 percent off your usual curl weight to maintain control.

Can you do incline dumbbell curls with alternating arms or must you curl both at once?

Both approaches work. Curling simultaneously is time-efficient and keeps tension balanced across both arms. Alternating allows you to focus on each arm individually and may reduce any compensatory shoulder movement. If you notice one arm swinging more than the other, alternating reps is a practical fix — it forces you to own each rep before starting the next.