🫀 What is the “calf muscle pump”?
Your calf muscles (mainly gastrocnemius and soleus) act like a pump for blood in your legs.
When you:
- walk
- stand on your toes
- move your ankles
👉 your calf muscles contract and squeeze the veins, pushing blood upward toward the heart.
🔁 How it works (simple)
- Blood in your legs needs to go upward (against gravity)
- Veins have one-way valves
- When calf muscles contract → they push blood up
- Valves prevent it from flowing back down
👉 This cycle repeats with every step you take.
❤️ Why it’s called the “second heart”
Because it:
- helps circulation just like the heart
- prevents blood from pooling in the legs
- supports oxygen delivery and waste removal
Without it, your heart would have a much harder job.
⚠️ What happens if it’s weak or inactive
If you sit or stand still for long periods:
- blood can pool in the legs
- swelling (edema) can occur
- risk of deep vein thrombosis increases
🏃 How to keep your “second heart” working
- walk regularly
- do calf raises
- move your ankles (especially during long sitting)
- avoid long periods of immobility
✔️ Takeaway
👉 Your calves are not literally a heart
👉 but functionally, they play a major role in circulation
👉 movement = better blood flow
