Build Big Arms With The Hammer Curl

Man performs hammer curl with dumbbells
(Image credit: iStock / Getty Images Plus)

If you’ve been spending hours in the gym trying to get bigger biceps with regular biceps curls and chin-ups, and yet remain entirely unsatisfied with the size of your upper arms, the chances are you’ve never heard of the brachialis muscle.

There’s no shame in that – who can keep tabs on all of the hundreds of muscles in the human body? However, the brachialis is one it’s worth getting acquainted with, because it’s a key muscle that any good biceps workout should target.

Your brachialis muscles are found on the outside of your upper arms right next to the biceps. By targeting the brachialis in your workouts, you’ll add mass to your upper arms and help your biceps stand out more. And the best arms exercise that works the brachialis is the hammer curl. Here’s how to do it.

How To Do A Hammer Curl

Starting and midway position of the dumbbell hammer curl exercise

(Image credit: Glen Burrows)

If you’ve been spending hours in the gym trying to get bigger biceps with regular biceps curls and chin-ups, and yet remain entirely unsatisfied with the size of your upper arms, the chances are you’ve never heard of the brachialis muscle.

There’s no shame in that – who can keep tabs on all of the hundreds of muscles in the human body? However, the brachialis is one it’s worth getting acquainted with, because it’s a key muscle for anyone hitting the gym with the aim of building sleeve-busting upper arms.

Your brachialis muscles are found on the outside of your upper arms right next to the biceps. By targeting the brachialis in your workouts, you’ll add mass to your upper arms and help your biceps stand out more. And one of the best ways to work the brachialis is to add the hammer curl to your training routine. Here’s how to do it.

Hammer Curl Variations

Seated hammer curl

Set up an adjustable bench at 90° so you can sit on the end of the bench with your back against it. Grab your dumbbells and let them hang at your sides with your palms facing each other. Keeping your back against the bench and your elbows tucked in, curl the weights up to your shoulders, then slowly lower them. The advantage of having your back against the bench is that it ensures your biceps are taking the load by preventing you from rocking your body and using momentum to help with the curl.

Rope cable curl

Hammer curl using rope attachment on cable machine

(Image credit: Getty Images / Juan Algar)

Using a cable machine means that you work against a consistent level of resistance throughout the movement. In the case of the hammer curl this means the same level of resistance at the top of the movement as the bottom. Attach a rope handle to the low pulley on a cable machine. Curl it up with your palms facing one another, keeping your core braced throughout the movement.

Alternating hammer curl with twist

Man performs dumbbell hammer curl with twist

(Image credit: iStock / Getty Images Plus / Sarah McEwan)

In this variation of the hammer curl you lift one dumbbell at a time and twist your wrists at the top of the movement to hit the biceps from a different angle. Start with your wrists facing one another, then turn them to face you at the top of the curl so the position is the same as when doing regular biceps curls.

Joe Warner
Former editor of Men’s Fitness UK

Joe Warner is a highly experienced journalist and editor who began working in fitness media in 2008. He has featured on the cover of Men’s Fitness UK twice and has co-authored Amazon best-sellers including 12-Week Body Plan. He was the editor of Men’s Fitness UK magazine between 2016 and 2019, when that title shared a website with Coach.