The gastrocnemius and the soleus are the two separate muscles that make up your calves. Since the gastrocnemius muscle runs from the knee to the ankle, it's best to work it out with your leg straight. Since the soleus muscle only goes over the ankle, bending your knee puts the work on it. The gastrocnemius is worked by straight-leg calf raises, while sitting or bent-knee raises work the soleus.
Since the gastrocnemius muscle is found in two joints, bending the knee makes it shorter, which makes it less able to generate force at the ankle. There is no difference in how busy the soleus is because it only crosses the ankle. Knowing this helps you choose better ways to exercise. If you want to get bigger calves, you'll need to train both muscles carefully, because they react differently based on where your knee is during the movement.
Since the gastrocnemius muscle passes over the knee joint, how much plantar flexion it can help with depends on how much slack you put in the knee joint. When you do straight-leg calf raises with your knee extended, both the medial and lateral gastrocnemius muscles are still under enough stress to make a difference. When you bend your knee, that strain goes down, which makes them less involved.
This is the main difference between training the soleus and the gastrocnemius. There is still some work for the gastrocnemius in bent-knee calf raises, but the soleus gets more work because it only crosses the ankle and isn't affected by the knee position.
By switching between straight-leg calf raises and variations with a bent knee, you can change how much each muscle is used instead of just focusing on one.
You need more than just knowledge to work out each muscle. You also need a plan that combines the two. For your first lower-body workout, do one with straight legs, like standing calf raises, and one with bent knees, like seated calf raises. Instead of focusing on one muscle over the other, that set works the whole triceps surae.
When working on the gastrocnemius, keep the knee joint straight, and when working on the soleus, keep it bent. Over time, add more weight to both movements, and don't forget to check your range of motion for either. Take into account the secondary work that squats and lunges do on the calves when you figure out the total volume.
When you focus on lower-leg balance, you don't work out either muscle enough, which is what causes your calves to grow all the way around.
What Makes the Soleus and Gastrocnemius Different?
Both muscles do the same thing, which is plantar flexion, but they are different in important ways. The gastrocnemius has two heads, one on the medial side and one on the lateral side. It runs through the knee and the ankle. The soleus sits below it and only goes over the ankle. This fundamental difference is what makes the position of the knees so important for training the calves.Since the gastrocnemius muscle is found in two joints, bending the knee makes it shorter, which makes it less able to generate force at the ankle. There is no difference in how busy the soleus is because it only crosses the ankle. Knowing this helps you choose better ways to exercise. If you want to get bigger calves, you'll need to train both muscles carefully, because they react differently based on where your knee is during the movement.
How Knee Position Determines Which Calf Muscle You're Targeting
Since the gastrocnemius muscle passes over the knee joint, how much plantar flexion it can help with depends on how much slack you put in the knee joint. When you do straight-leg calf raises with your knee extended, both the medial and lateral gastrocnemius muscles are still under enough stress to make a difference. When you bend your knee, that strain goes down, which makes them less involved.
This is the main difference between training the soleus and the gastrocnemius. There is still some work for the gastrocnemius in bent-knee calf raises, but the soleus gets more work because it only crosses the ankle and isn't affected by the knee position.
By switching between straight-leg calf raises and variations with a bent knee, you can change how much each muscle is used instead of just focusing on one.
Best Calf Exercises to Isolate the Gastrocnemius
When you work out your calves, keeping your knee straight makes the gastrocnemius muscle able to do its job. Since it goes over the knee, a straight leg lets it create force all the way through its range of motion. Standing calf raises, donkey or leg presses, and standing calf raises are the best exercises for the gastrocnemius because they all keep the knee fairly extended. For lower leg growth, you need to load these moves gradually and focus on each rep instead of bouncing through the stretch. When you bend your knee, you focus on the brevis instead of the gastrocnemius, which is why bent-knee calf raises are different. If you want to improve the size and shape of your gastrocnemius, you should focus on straight-leg work.Best Calf Exercises to Isolate the Soleus
When you bend your knee while working out your calves, the gastrocnemius muscle shortens at the knee end. This makes the soleus muscle do more of the plantar-flexion work. When you do seated calf raises, your knee stays bent during every rep, making them the most useful soleus exercises. When you bend your ankle, the gastrocnemius muscle relaxes across the joint. This shifts the demand to the soleus muscle without turning off the gastrocnemius fully. If you can't find a machine that lets you sit down, bent-knee standing raises work the same way. Gradually load the movement, keep an eye on the range of motion, and don't bounce at the bottom. Because the soleus adds thickness to the lower calf, training with the knee bent along with straight-leg work leads to more complete growth of the lower legs as a whole.How to Program Both Muscles Into Your Calf Training
You need more than just knowledge to work out each muscle. You also need a plan that combines the two. For your first lower-body workout, do one with straight legs, like standing calf raises, and one with bent knees, like seated calf raises. Instead of focusing on one muscle over the other, that set works the whole triceps surae.
When working on the gastrocnemius, keep the knee joint straight, and when working on the soleus, keep it bent. Over time, add more weight to both movements, and don't forget to check your range of motion for either. Take into account the secondary work that squats and lunges do on the calves when you figure out the total volume.
When you focus on lower-leg balance, you don't work out either muscle enough, which is what causes your calves to grow all the way around.
