Do Curls Work Triceps? Say Goodbye to Flabby Arms!

Do Curls Work Triceps

When it comes to fitness and understanding the mechanics of muscle workouts, there’s always a bit of myth mixed in with the science. One such curious question that has been raised time and time again is whether bicep curls work the triceps.

At a glance, it may seem like an odd question. After all, curls are primarily known as a bicep-focused exercise. However, the human body and its muscular connections are complex. After doing this exercise for a certain period of time, I’ve discovered that the triceps are most definitely active, but not in the way you would think.

Anatomy of the Arm Muscles

Anatomy of the Arm Muscles

Before addressing the core question, it’s crucial to understand the basic anatomy of the arm muscles. Your arm isn’t just about biceps and triceps; there’s an intricate interplay of various muscles that work in harmony.

Biceps Brachii

Biceps Brachii, often simply referred to as the biceps, is a two-headed muscle located on the upper arm between the shoulder and the elbow. This muscle’s primary function is the flexion of the elbow and supination of the forearm.

Many exercises, including curls, target the biceps directly. However, beyond its prominent appearance and role in arm flexion, the biceps also play a part in stabilizing the shoulder during certain movements. Its secondary functions can sometimes involve or affect other surrounding muscles, but this interaction isn’t as direct as one might think.

Triceps Brachii

The Triceps Brachii, known commonly as the triceps, is the muscle on the back of the upper arm. It’s mainly responsible for the extension of the elbow joint.

This muscle group has three distinct heads: the long, lateral, and medial head, which work together during triceps-focused exercises like push-downs or extensions. In contrast to the biceps, the triceps acts as an antagonist muscle during curling movements.

This means they perform the opposite motion of the biceps. While they aren’t the primary muscle being worked during a curl, they still play a role in the movement.

Dynamics of the Curl Movement

Dynamics of the Curl Movement

With a grasp of basic arm anatomy, we can better understand the interplay of muscles during specific exercises.

The Upward Phase

As you initiate a curl, the primary muscle doing the work is the biceps. As you lift the weight, the biceps contract, pulling your forearm up. During this phase, the biceps are in a state of concentric contraction, meaning they’re shortening as they work.

However, during this upward phase, the triceps are not entirely inactive. They serve as stabilizers, ensuring your arm moves in a controlled manner. This action is subtle and might not directly work the triceps, but it does engage them to some extent.

The Downward Phase

Now, as you lower the weight during a curl, the biceps transition to an eccentric contraction. In this state, the muscle lengthens while still generating force. This phase is critical for muscle growth and strength as it creates micro-tears in the muscle fibers.

The triceps’ role in the downward phase is more pronounced than during the upward movement. As you control the weight while lowering it, the triceps assist in decelerating the forearm. This means they’re working to ensure the motion is smooth and controlled, but they’re still not the primary muscle being targeted.

Clarifying the Misconceptions

biceps and triceps Curl Movement

The interaction between the biceps and triceps during a curl can lead to some misunderstandings.

The Myth of Dual Activation

One common misconception is that during a curl, the triceps are being worked as hard as the biceps. This belief stems from the triceps’ engagement during the movement. While it’s true they’re engaged, it’s crucial to differentiate between active engagement and passive engagement.

The triceps are passively engaged, serving more as stabilizers rather than primary movers. The level of activation is minimal compared to the direct work the biceps are doing. Thinking that curls can replace triceps-specific exercises would be a mistake.

Importance of Targeted Training

For optimal arm development and strength, it’s essential to train both the biceps and triceps directly. While compound movements can engage multiple muscle groups, targeted isolation exercises ensure that each muscle gets the attention it needs to grow and strengthen.

Relying solely on curls for arm development would lead to an imbalance in strength and aesthetics. It’s always a good idea to incorporate a mix of exercises that target both the front and back of the upper arm to achieve a balanced, functional, and aesthetic result.

The Role of Secondary Muscles

Curl Movement Role of Secondary

Every primary exercise movement engages secondary muscles to some extent. Understanding these secondary engagements provides clarity on the complete impact of an exercise.

Stabilizers in Action

Stabilizer muscles play a pivotal role in maintaining posture and ensuring correct form during exercise. While performing bicep curls, several muscles act as stabilizers. The deltoids (shoulder muscles) and the brachialis (located underneath the biceps) are notable examples.

However, the triceps’ role as stabilizers during curls is often misunderstood. As discussed, they do stabilize, but their engagement is minimal compared to the biceps. They ensure that the movement is fluid and that the arm remains in the correct position throughout the curl.

Synergists in the Curl Movement

Synergists are muscles that assist the primary mover in performing an action. In the case of bicep curls, the brachioradialis (a muscle in the forearm) acts as a synergist, aiding the biceps in flexing the elbow.

It’s important to note that the triceps don’t act as synergists in the curl movement. Instead, their role is more of subtle stabilization and deceleration, especially during the downward phase of the curl.

Common Mistakes and Their Impact

Curl Movement Mistakes

Form is paramount in any exercise. A slight error can shift the focus from the target muscle to other areas, potentially leading to inefficiency or even injury.

Overcompensating with the Shoulders

One common mistake during curls is using the shoulders to lift the weight, especially when the weight is too heavy. This not only reduces the focus on the biceps but also unnecessarily strains the shoulder muscles.

Another consequence of this mistake is the engagement of the triceps in an attempt to assist the shoulder movement. While this isn’t direct engagement, it’s a misuse of the triceps and can lead to muscle imbalances over time.

Hyperextension of the Elbows

Hyperextending the elbows, or locking them out, at the bottom of a curl can shift some tension away from the biceps. This not only reduces the effectiveness of the curl but also puts undue stress on the elbow joint.

When this happens, the triceps, along with the tendons and ligaments surrounding the elbow, experience increased tension. Continuous hyperextension can lead to potential injuries or strains in the triceps and elbow joints.

Complement Curls with Tricep Exercises

To ensure balanced arm development and strength, it’s crucial to pair bicep exercises with tricep-focused workouts. Tricep extensions, whether performed with dumbbells, cables, or barbells, are fantastic exercises to isolate and work the triceps.

Just as curls focus on the biceps, extensions target the triceps directly, ensuring they get the required stimulus for growth. Regularly incorporating tricep extensions into your routine ensures that the triceps aren’t neglected. This not only enhances arm symmetry aesthetically but also ensures functional balance.

Dips and Push-ups for Balanced Development

Dips and push-ups are compound movements that majorly engage the triceps. While they also work other muscles, such as the chest and shoulders, the triceps are the primary movers in these exercises.

Incorporating these exercises alongside curls in a workout routine ensures that both the front and back of the arm receive adequate attention. This holistic approach promotes overall arm strength, function, and appearance.

Create Your Workout Routine!

Workout Routine

To help you achieve your goals, here’s a sample arm workout routine that includes curls. Customize the weights and repetitions based on your fitness level and goals.

Exercise Sets x Reps Rest Between Sets
Jumping Jacks 1 x 1 minute 1 minute
Arm Circles 1 x 1 minute
Main Workout
Barbell Bicep Curls 4 x 10-12 60 seconds
Dumbbell Hammer Curls 3 x 12-15 45 seconds
Push-Ups 3 x 10-15 60 seconds
Tricep Dips 4 x 10-12 60 seconds
Dumbbell Skull Crushers 3 x 12-15 45 seconds
Concentration Curls 3 x 10-12 (each arm) 45 seconds
Cool Down
Stretching 5 minutes

Remember to start with a weight that challenges you but allows you to complete the recommended reps with proper form. Gradually increase the weight as you progress. Always consult a fitness professional before starting a new workout routine, especially if you have any pre-existing medical conditions.


Why is it important to focus on form when doing arm exercises?

Proper form ensures that the correct muscles are engaged, reducing the risk of injury and maximizing the effectiveness of the exercise.

How often should I do the arm workout to get rid of flabby arms?

Incorporate the inner arm workout into your weekly routine.

Should I be afraid of using heavy dumbbells?

No, using heavy dumbbells can help tone, strengthen, and define the muscles in your biceps, shoulders, and triceps faster.

What weight of dumbbells is recommended to start with?

Start with 8- or 10-pound dumbbells, but always listen to your body.

How many sets and reps should I aim for?

Aim for 2 or 3 sets of 12 to 15 reps of each exercise.

The Bottom Line

In summary, while curls do engage the triceps to a minimal extent, they’re primarily a bicep-centric exercise.

For comprehensive arm development, ensure your routine includes dedicated exercises for both biceps and triceps. Fitness is all about understanding, balance, and consistent effort.