Which Is Better For Stronger Muscles: Compound or Isolation Exercises?

Maximize Your Muscle Gains: The Pros and Cons of Compound and Isolation Exercises

Compound and isolation exercises are two types of resistance training that are often used to improve muscle strength and mass. Both are useful for building strong muscles.

But which one is better for building strong muscles, compound or isolation exercises?

Let’s discuss what compound and isolation exercises mean, what their pros and cons are, and which one is better for building strong muscles.

What Are Compound Exercises?

Compound exercises are exercises that involve the use of multiple muscle groups and joint movements. Rather than one prime mover (main muscle group) working across one joint at a time, compound exercises require multiple prime movers and multiple synergists (muscles that assist or aid in the execution of the exercise) to act across multiple joints. Some resources refer to compound exercises as “multi-joint” exercises; the terms are usually synonymous.

Examples of compound exercises include squats, push-ups, and deadlifts. These exercises are typically performed using free weights or body weight, and they are designed to challenge the body’s overall strength and stability.

What Are Isolation Exercises?

Isolation exercises, on the other hand, are exercises that involve the use of a single joint movement and target a specific muscle group. There is only one prime mover, fewer synergists, and one joint action occurring during isolation exercises. These can be referred to as “single-joint” exercises.

Examples of isolation exercises include bicep curls, tricep extensions, and leg curls. These exercises are typically performed using machines or free weights, and they are designed to target and isolate specific muscle groups.

Pros and Cons of Compound Exercises

Compound exercises have numerous pros. Some of the benefits of compound exercises include:

• They help increase muscle strength and mass more efficiently: They engage multiple muscle groups at once, which can lead to more muscle activation, more muscle fiber recruitment, and greater demand on the musculoskeletal system
• Less is more: If performing compound exercises, you usually don’t have to do as many different exercises in a workout, since you are activating more muscles in one specific exercise.
• Functionality: Compound exercises have a ton of carryover into daily life. We are constantly squatting, deadlifting, pushing, etc, throughout the day, whether we realize it or not. By including compound exercises in our exercise routine, we improve our ability to do mundane tasks like standing up from a couch, carrying heavy boxes, and pushing heavy doors open.

The cons of compound exercises are few, but they are present:

• They are physically demanding: Performing compound movements can lead to faster fatigue than isolation exercises. This leads to a longer recovery time and a lower training frequency
• They often require practice and technical skill. Compound exercises like barbell squats and pushups require technical skill to be able to perform them. Often it takes multiple workouts over a period of days/weeks/months to master the movement, along with frequent practice to keep the skill.

Pros and Cons of Isolation Exercises

Like any type of exercise, isolation exercises have their pros. Some of the benefits of isolation exercise include:

• Targeted Muscle Strengthening: Isolation exercises do exactly what their name implies, which is isolating one specific muscle and allowing them to work to get stronger. This is great if some specific muscles are weak and you want to improve their strength. By removing the aid of other stronger muscles, you can really target your weak points.
• Muscle Definition: If you are looking for definition in muscles that don’t appear as you’d like, isolation exercises are a great way to add size and definition.
• Less Demanding for More Reps: If you can’t afford to fatigue your body or handle the demands of a more grueling routine, isolation exercises are less demanding and easier to perform more frequently or for more volume.

Isolation exercises, also have their cons, including:

• Less Overall Muscle Strength: In order to maximize muscle strength and size, compound exercises are indisputably the best. While isolation exercises improve strength in weaker muscles, they’re not as effective at improving muscle strength as a whole.
• Less carryover: Isolation exercises are great for targeting and adding definition for specific muscles. However, they are much less functional than compound movements in many instances. Isolation exercises may aid in functional movement, but in a much more indirect way.

So Which is Better for Stronger Muscles, Compound or Isolation Exercises?

While both have their benefits, and the answer may slightly vary depending on your interpretation of the question, the best answer to this question is that compound exercises are better for building stronger muscles, and likely should be the foundation of your resistance training program.

Compound exercises engage multiple muscle groups and joints at once, put greater demand on your musculoskeletal system, and promote greater physiological adaptations than isolation exercises. Compound exercises also have greater carryover into daily life. If your goal for strength training is stronger muscles and greater functionality outside the gym, compound exercises should be your priority.

This isn’t to say isolation exercises shouldn’t be included in your training; they absolutely should. However, they should be included as accessory movements; movements that complement your compound lifts to improve strength in weak areas of your body.

To improve muscle strength using compound and isolation exercises, you should be performing resistance training at least 2–3 days per week. Prioritize your compound exercises, and incorporate isolation exercises later/toward the end of your workout to address weak points and complement your major compound movements.

Do this on top of a healthy diet, 8 hours of sleep, and proper progressive programming, and watch your strength gains explode.

Thank you for taking the time to read my work, I appreciate you more than you realize. If you like what you’re reading, there are a few ways I can help you reach your health and fitness goals.

Follow me on Medium for more articles about fitness, injury rehabilitation, and athletic performance. Click here to subscribe, if you don’t already.

Apply here for online coaching or a one-time consultation, where I can help you lose weight, get stronger, recover from injury, and/or improve your athletic performance.

*NEW* Check out our E-products. Our FREE Nutrition Foundations Guide covers key concepts about the basics of nutrition with practical applications. Our Training Foundations Guide is a fully customizable strength training program for beginner to intermediate lifters, and is less than the cost of one personal training session at an average gym.