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Does Running Build Muscle? The Truth Revealed

Does Running Build Muscle? The Truth Revealed

July 15, 2026

Key Takeaways


  • Running alone may not build significant muscle mass, but it can complement a strength training program to enhance muscle growth.
  • High-intensity interval training (HIIT) and other forms of short, intense running can lead to modest increases in muscle size, particularly in the quadriceps.
  • Long-distance running may inhibit muscle growth due to the significant muscle damage it can cause.
  • Proper nutrition, including adequate protein intake, is essential for supporting muscle building through running.
  • Following a balanced diet and staying hydrated are crucial for individuals looking to build muscle through running.

Introduction


Many think running can cause ""muscle loss."" This idea comes from a 1980 study. It showed strength gains were better in those doing only resistance training. But, newer studies have shown the real deal about cardio and muscle growth.

It turns out, doing cardio and strength training together can actually boost strength. A review of fourteen studies found this. It also showed that muscle mass doesn't drop much. In fact, strength training makes muscles and joints stronger, helping runners go further.

Adding running to your workout can make muscles stronger and more dense. A 2017 study found runners got 10% bigger quadriceps after 10 weeks. The trick is finding the right mix of cardio and strength training to build muscle.

""The type of training and workouts you do play a crucial role in reaching your muscle gain goals, according to a 2014 study in Exercise and Sport Sciences Reviews.""

So, the idea that does cardio kill muscle or that cardio and muscle growth don't mix is a myth of cardio and muscle loss. With the right approach, running and other cardio can help build muscle.

The Impact of Running on Muscle


Running's effect on muscle growth varies with intensity and duration. High-intensity, short-duration running, like sprinting or HIIT, can stimulate muscle growth, especially in the lower body muscles like the quadriceps. This is because high-intensity exercise can block proteins that hinder muscle growth and reduce muscle protein breakdown.

However, long-distance running can significantly increase muscle protein breakdown, which can hinder muscle growth. Yet, a 2015 study in Exercise and Sport Sciences Review found that aerobic exercises like running can still lead to muscle growth, known as muscle hypertrophy.

Building muscle through running is more prominent during faster runs like HIIT workouts and runs with elevation changes, which activate muscles like glutes, hamstrings, quads, and calves to strengthen legs. Running can result in muscular changes for beginner runners. But, it may not lead to substantial muscle build for consistent runners. This highlights the importance of strength training for muscle building.

|--------------------|------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------| | Muscle Group | Impact of Running | Recommended Exercises | | Hip Flexors | Critical muscles engaged during running, particularly in sprint and hill workouts | Strengthen regularly to maintain range of motion and prevent injuries | | Quadriceps | Play a significant role in absorbing impact upon landing, aiding in push-off power and endurance | Single-leg exercises to simulate running forces | | Calf Muscles | Crucial for push-off power during running | Exercises like calf raises to prevent reduced force production and potential injury | | Hamstrings | Essential for speed and force production in the push-off phase of running | Exercises like Bulgarian split squats and good mornings to strengthen and maintain flexibility | | Glute Muscles | Key in propelling the body forward and stabilizing the pelvis | Exercises like step-ups and hip thrusts for strengthening | | Core Muscles | Vital for stability and spine support during running | Exercises such as dead bugs to enhance core strength | | Upper Body Muscles | Neglecting can impact running performance due to poor posture, limiting breathing capacity and overall running economy | Exercises such as bent-over rows and push-ups to improve posture and running efficiency |

Incorporating different running styles into training, along with strength training and a balanced diet, can contribute to muscle growth. Each body may require a different training and nutritional regime to achieve muscle-building results. This shows the uniqueness of individual bodies in responding to training programs.

How Running Affects Muscle Building


Muscle Protein Synthesis and Breakdown


Muscle building is a balance between adding and removing protein from muscles. Many think running always means losing muscle, but it's not that simple.

Short, intense runs like sprints or HIIT can actually help build muscle. They boost the addition of protein to muscles and reduce protein loss. Long-distance running, however, can lead to more muscle breakdown, which slows growth.

A study in the International Journal of Exercise Science found a big 11% muscle gain in 10 weeks with HIIT. But, endurance runners in the Journal of Physical Therapy Science saw more muscle breakdown after long runs. The more they ran, the more muscle they lost.

It's important to balance running with strength training. Experts say to limit cardio to half the time spent on muscle exercises. This helps avoid negative effects from too much running or cardio.

Running can help build muscle if you have enough protein, carbs, and fats. Focus on short, intense runs and combine them with strength training and good nutrition.

Does Running Build Muscle?


Running may not build muscle as much as strength training does. But, it can still increase muscle size, especially in the legs. The type and intensity of running workouts matter a lot.

High-intensity, short-duration running, like sprinting or HIIT, can grow the quadriceps by up to 11% in some studies. This is because such intense workouts boost muscle protein growth and slow down muscle breakdown.

Long-distance running, however, can damage muscles and break them down more than it builds them up. The constant impact and motion of long runs can cause muscle loss instead of gain.

To build muscle while running, mix up your routine. Include both intense interval training and strength exercises. Don't forget to eat right and rest well. This balanced approach can help runners build muscle and perform better.


""Running mainly works the core and lower body muscles, like the hips, glutes, and legs. A strong core is key for stability, proper form, and keeping the spine aligned while running.""

To build muscle through running, remember to:

  • Do high-intensity interval training (HIIT) or sprints to grow muscles
  • Add strength exercises to target big muscle groups
  • Eat enough protein to help muscles repair and grow
  • Get enough rest and recovery time between workouts

By balancing endurance and strength training, runners can improve their muscle development and performance while enjoying this popular exercise.

Sample Running Workouts for Muscle Building


Many think running leads to muscle loss. But, the right approach can actually build and keep muscle mass. High-intensity interval training (HIIT) running is especially good for muscle growth.

Here are some sample HIIT running workouts for building muscle:

  1. 6 sets of 20-second sprints at maximum intensity, separated by 2 minutes of walking or light jogging
  2. 5 sets of 30-second sprints at maximum intensity, separated by 4 minutes of walking or light jogging
  3. 4 sets of 45-second sprints at moderate intensity, separated by 5 minutes of walking or light jogging
  4. 4 sets of 30-second hill sprints, separated by the time it takes to walk back down the hill

Do these HIIT running workouts 3-4 times a week. Make sure to warm up and cool down to avoid injuries and aid recovery. This mix of high-intensity intervals and rest helps grow muscle and boost running speed.

Building muscle through running takes time and effort. But, the rewards are worth it. Adding running workouts for muscle growth to a balanced diet and strength training creates a strong fitness routine. It supports your health and performance goals.

""Balancing running and strength training through a well-managed routine can prevent fatigue, poor recovery, and injury.""

|------------------------|--------------|---------------|------------------------| | Workout | Duration | Intensity | Recovery | | 6 sets of sprints | 20 seconds | Maximum | 2 minutes | | 5 sets of sprints | 30 seconds | Maximum | 4 minutes | | 4 sets of sprints | 45 seconds | Moderate | 5 minutes | | 4 sets of hill sprints | 30 seconds | Moderate | Time to walk back down |

The Importance of Proper Nutrition


Proper nutrition is key for building muscle, whether you run a lot or lift weights. Your diet needs the right mix of protein, carbs, and healthy fats to grow muscles.

Protein for Running and Muscle Growth


Protein is vital for muscle building. You should eat 0.64 to 0.91 grams of protein per pound of body weight daily. Good protein sources include lean meats, dairy, fish, eggs, soy, beans, and legumes.

Carbs and Fats for Running and Muscle Development


Carbs are also important for running and giving your muscles energy. Healthy fats help with muscle building by boosting growth hormone levels.

Hydration for Running and Muscle Building


Drinking enough water is also essential for health and performance. It helps with muscle recovery and growth, and moves nutrients to your muscles.

Eating a balanced diet with enough protein, carbs, healthy fats, and water helps build and keep muscle. It also boosts your running performance.

""A well-balanced diet with proper nutrition is the foundation for building muscle, whether you're a runner or a strength athlete.""

The Role of Running in Muscle Building


Running doesn't build muscle as much as weightlifting does. But it helps in a big way. Running boosts your endurance, letting you recover faster and do more strength training. It also makes your muscles get more blood and nutrients, which helps them grow. Running uphill, for example, can be as good as strength training for building muscle.

A study by the British Sports Journal showed that sprinters who build muscle can run better. They found that these athletes can run up to 8% more efficiently. Researchers at Taylor University found that running makes your muscles bigger, especially in your legs.

The journal Exercise and Sport Sciences Reviews said running works many leg muscles. This is because running involves moving your body weight. Power athletes, like sprinters, have more fast-twitch muscles. This helps them run fast.

A study with 12 college students showed that running can make your muscles bigger. They did high-intensity interval training for 10 weeks and saw a big increase in muscle size. Another study with 30 male runners found that running long distances also makes muscles bigger.

Even though running isn't the main way to build muscle, it's still very helpful. It improves your endurance, increases blood flow, and works many muscles. This makes running a great addition to your muscle-building routine.

Does Running Build Muscle?


Many think running is bad for building muscle. But, it's more complicated than that. Running can help with muscle growth, but it's not as effective as weight training. It's important to know how running affects muscles and how to use it in a workout plan.

High-intensity running, like sprinting, can slightly increase muscle size in the legs. This is because it boosts muscle protein synthesis and helps muscles grow. However, long-distance running can actually harm muscle growth. It causes muscle damage and leads to more muscle breakdown than growth.

To build muscle well, mix running with weight training and good nutrition. Adding short runs, HIIT, and strength exercises can help muscles grow. It also improves heart health.

Running can also boost growth hormone levels, which are key for muscle growth. Weight training can quickly raise growth hormone, but running keeps it high longer than lifting weights.

In summary, running is not the main way to build muscle. But, it's a good part of a full muscle-building plan. Knowing how running affects muscles and adding it to a balanced workout can help reach fitness goals.

|------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Study | Finding | | US Army's research institute | Bursts of weight training temporarily spike growth hormone levels, while steady-state cardio sends growth hormone soaring and delivers a longer-lasting boost than weight lifting. | | Swedish researchers | Adding BCAAs to a pre-workout shake 15 minutes before cardio can prevent muscle breakdown for energy during the workout. | | Various athletes | Athletes like Alexander Gustafsson, Yohan 'The Beast' Blake, George North, Floyd Mayweather, and Michael Phelps engage in abundant cardio alongside their training and still maintain size and strength. |

""While weight training is crucial for muscle and strength development, incorporating cardio into the routine can bring about quicker physical transformations due to its impact on growth hormone levels.""

Conclusion


The link between running and building muscle is not simple. Running itself doesn't directly build muscle, but it helps in other ways. High-intensity runs can boost muscle growth, especially in the legs.

But, long-distance running can harm muscles and slow growth. To really build muscle, mix running with strength training. Also, don't forget good nutrition and rest.

The Physical Activity Guidelines for Americans say adults should do muscle-strengthening exercises two times a week. Studies show that doing three weight sets is better than one. Still, even one set can help.

Adults should also do at least 150 minutes of moderate activity or 75 minutes of hard activity weekly. This keeps muscles strong.

Good food is key for muscle growth. Women need 46g of protein daily, and men need 56g. Eating 20g of protein after exercise helps muscles grow and recover.

FAQ


Does running build muscle?


No, running doesn't build muscle like strength training does. But, high-intensity interval training (HIIT) can slightly increase muscle size, especially in the quadriceps.

Can cardio like running ""kill"" muscle gains?


Many think cardio, like running, can ruin muscle gains. But, recent studies show it doesn't necessarily interfere with muscle growth. You can mix cardio and strength training to grow muscle.

How does the intensity and duration of running affect muscle growth?


Running's effect on muscle growth varies with intensity and duration. Sprinting or HIIT can boost muscle growth in the lower body. But, long-distance running can break down more muscle protein, slowing growth.

What is the relationship between muscle protein synthesis and breakdown when running?


Muscle building happens when you add more protein to muscle than you remove. Sprinting or HIIT can increase protein addition and decrease removal. Long-distance running, however, can break down more protein, slowing growth.

Can running actually build muscle?


Running doesn't build muscle as much as strength training. But, it can slightly increase muscle size, especially in the lower body. Sprinting or HIIT can grow the quadriceps by up to 11% in some studies.

What types of running workouts are best for muscle building?


For muscle building, try high-intensity interval training (HIIT) workouts. Examples include sprints, hill sprints, and short, intense runs.

How important is nutrition for building muscle through running?


Good nutrition is key for muscle growth, whether running or strength training. You need enough protein, the muscle's building block. Aim for 0.64-0.91 grams of protein per pound of body weight daily.

How can running support muscle building in other ways?


Running may not build muscle like strength training. But, it supports muscle growth in other ways. It boosts aerobic capacity, helping you recover faster and do more strength training. Running also increases muscle capillaries, improving blood flow and nutrient delivery for muscle growth.

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