Arms · Elbow flexion

Bicep Curl Machine

The bicep curl machine is a seated exercise where your upper arms rest on a pad and you curl handles or a bar through a fixed arc. The pad and path remove swinging and balance, so the biceps can be taken close to failure safely, making it a simple option for beginners and for finishing a biceps session.

Also known as: Seated bicep curl machine, Machine bicep curl, Biceps curl machine

Muscle group: Arms
Movement pattern: Elbow flexion
Type: Isolation
Equipment: Bicep curl machine
Difficulty: Beginner

What muscles does the bicep curl machine work?

Primary movers

Biceps brachii

Assisting muscles

Brachialis
Brachioradialis
Forearm flexors

The biceps flex the elbow while the machine controls the path. Your upper arms rest on a pad, so the shoulders cannot help.

Alignment matters. Your elbows should line up with the machine's pivot, otherwise the arc feels awkward and may strain the joint.

The fixed load means you can push to failure without a spotter and use techniques like drop sets safely.

Because the machine limits stabiliser demand, it complements free-weight curls instead of replacing them.

How to do the bicep curl machine

Setup

1
Adjust the seat so your upper arms rest flat on the pad and your elbows line up with the pivot.
2
Grip the handles with an underhand grip.
3
Sit tall with your chest against the pad.
4
Select a weight you can control.

Execution

1
Curl the handles up toward your shoulders.
2
Squeeze your biceps at the top.
3
Lower slowly until your arms are nearly straight.
4
Keep your upper arms on the pad.
5
Keep your chest against the support.
6
Do not let the stack touch down.

Common bicep curl machine mistakes

Misaligned seat

Elbows off the pivot cause an awkward arc.

The fix: Adjust the seat before the set.

Lifting the elbows

Raising the arms off the pad shifts the work.

The fix: Keep the backs of your arms on the pad.

Using too much weight

Heavy loads shorten the range.

The fix: Use a weight you can curl for 10 to 12 reps.

Swinging

Leaning back to curl reduces biceps work.

The fix: Keep your chest on the pad.

How many sets and reps?

Goal	Sets	Reps	Load	Rest
Hypertrophy	3	10–15	Moderate, 1–2 RIR	60 s
Drop sets	2	To failure, then lower the weight	Moderate to light	60 s
Beginner	2	12	Light	60 s

A finisher after your free-weight curls. Use a slow tempo and a squeeze at the top. Track the seat setting so you can repeat it.

Running the bicep curl machine in your next block? Hercules logs every set, shows last session's numbers before you lift, and suggests when to add weight.

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