THE TAKEAWAY: Your soleus and gastrocnemius muscles actively pump deoxygenated blood back toward your heart against gravity during simple daily movement.

Often called the "peripheral heart," the deep muscular compartments of the lower leg compress valved deep veins every time you take a stride or flex your ankle. Prolonged sitting deactivates this pump, leading to fluid pooling and reduced cardiac output. Simple calf raises, walking breaks, and ankle mobility work actively restore efficient systemic circulation.