Every step taken, every stretch made, a hidden muscle in the legs is hard at work. It doesn’t just help with balance or movement; it supports one of the body’s most vital systems, circulation. Experts even call it the “second heart” because of the way it keeps blood flowing smoothly through the body. Yet, most people don’t pay attention to it until fatigue, cramps, or swelling appear. Understanding how this muscle works and keeping it strong could make all the difference to long-term vascular health. Here's everything you need to know about the 'second heart'. Take a look...
Why is the calf muscle called the ‘second heart’
- The calf muscle plays a crucial role in human physiology beyond facilitating walking and running.
- Vascular specialists commonly refer to the calf muscle as the body's 'second heart' due to its vital role in aiding blood circulation.
- The calf muscle assists in the circulation of blood back toward the heart, working against the force of gravity.
When the calf muscles contract, they squeeze deep veins in the legs, working like a natural pump. This action helps prevent blood from pooling in the lower limbs and supports the heart in maintaining smooth circulation. A
2021 review in the NIH highlighted that strong calf muscles improve venous return and reduce the risk of chronic venous insufficiency, a condition where blood flow from the legs slows down.
Nowadays, when people are more sedentary, spend most of their time in offices, and do not move, the symptoms of venous insufficiency, such as the heaviness of the legs, swelling of the ankle, varicose veins visible, and cramping, grow more frequent, even in young adults. Poor muscle tone, less movement and weak calves decrease the efficiency of this second heart. This may over time predispose to the occurrence of venous disorders and deep vein thrombosis, particularly among people with extensive desk work, who stand a lot of work, or travel a lot or those who are at risk due to gene predisposition.
Dr.Aashish Chaudhry, Managing Director & Head- Orthopaedics & Joint Replacement, Aakash healthcare
To put it simply, whenever a person walks, ascends stairs, or even rises up on their tiptoes, the muscles in the calves play a crucial role in assisting the heart in circulating blood effectively throughout the entire body.
Walk more, but walk smart
One of the most effective and straightforward methods to enhance the functioning of the calf pump is through walking. However, it's important to note that both the speed of walking and the correct posture play a crucial role in this process. Engaging in a brisk walking routine for a minimum of 30 minutes each day can effectively stimulate the soleus muscle, which is the deeper muscle located in the calf and is responsible for pumping blood with remarkable efficiency.
<p>One of the earliest red flags is muscle spasms, especially in the calves or eyelids. This happens because magnesium helps regulate muscle contraction. Without enough of it, muscles tighten and struggle to relax.<br></p>
Experts recommend walking on varied surfaces or slight inclines to fully engage the muscle. Flat walking helps endurance, while uphill walking boosts strength and blood flow.
Try seated heel raises during desk work
For those who sit for long hours, calf inactivity can lead to sluggish blood flow. Doing simple seated heel raises every 30 minutes can significantly improve lower leg circulation and oxygen delivery.
Strong calf muscle can help lower blood sugar by increasing glucose uptake and improving metabolic regulation, with a simple exercise like calf raises being effective at reducing post-meal spikes. The soleus muscle in the calf is a key muscle for this, as it can sustain high levels of oxidative metabolism for hours, helping the body use sugar more efficiently.
Dr (Prof) Raju Vaishya, senior consultant, orthopaedic, joint replacement & arthroscopic surgery, Indraprastha Apollo Hospital
Don’t skip calf strength training
While gym routines often focus on bigger muscles, calf training is frequently neglected. Yet, resistance exercises like standing calf raises, skipping rope, or using a stair stepper help maintain calf tone and pump function.
Image credits: Getty Images
Sports medicine research shows that strong calves improve venous pressure and reduce leg fatigue. Just two to three sessions a week can make a measurable difference in circulation and stamina.
Stay hydrated and stretch
Dehydration thickens the blood, making it harder to circulate efficiently. Adequate hydration helps the calf muscle contract smoothly and prevents cramps. Stretching, especially after long hours of sitting or standing, keeps the calf flexible and improves blood vessel elasticity.
Experts suggest simple wall stretches or yoga poses like “Downward Dog” to lengthen and relax the muscle fibers that support venous flow.
Pay attention to footwear and posture
High heels or tight shoes limit ankle movement, weakening the calf’s pumping action over time. Orthopedic studies show that shoes with a small heel drop (2–4 cm) support natural calf engagement without strain.
Maintaining upright posture also matters. When standing tall with slightly bent knees, the calf muscles activate more efficiently, aiding both comfort and blood flow.
Regular exercise, proper hydration, and avoiding tight clothing around the calves also help maintain healthy blood flow. So, the next time you take a brisk walk or climb a flight of stairs, remember that you’re not only working your legs, you’re giving your heart a helping hand.Our “second heart” deserves care and attention every day.
Dr Kuldeep Malik, Associate Director, Orthopaedics & Joint Replacement, Max Super Speciality Hospital, Shalimar Bagh
The calf muscle is more than a structural support; it’s a silent, second heart that keeps the circulatory system working efficiently. Keeping it active through walking, stretching, and strength work is a simple but powerful way to prevent fatigue, swelling, and long-term vascular issues.
Healthy calves don’t just improve leg strength; they protect heart health from the ground up.Disclaimer: This article is for informational purposes only and should not replace medical advice. People with circulation issues, leg swelling, or heart conditions should consult a healthcare professional before starting new exercises or routines.Get an chance to win ₹5000 Amazon Voucher by taking part in India's Biggest Habit Index! Take the survey here
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