New Nordic - Active Legs Strong (for Swelling, Heaviness & Tingling of Legs) 30 TabletsThe sensation of heavy, tired and tingly legs can sometimes happen during long term inactivity (sitting, standing), but it can also come from an improper venous blood flow in our legs. This condition is called chronic venous insufficiency (CVI), and where the veins that circulate blood back to the heart are not working effectively.