You must have heard alot of times that lying or sitting in a position for along time (sedentary lifestyle) is bad for your health. A sedentary lifestyle is believed to increase ones risk to overweight, diabetes, and cardiovascular diseases.
It is advised that you stand and walk around after every 30 minutes of sitting or lying for a long period.
A reason for this advice is that, blood pools in the lower legs when the muscles are not squeezing the veins to move the blood towards the heart.
Under these conditions, a clot may form in a deep vein; a condition known as deep vein thrombosis. When the clot breaks off, gets to the lungs,and becomes trapped, it leads to shortage of blood supply, breathing difficulty, and put a strain to the heart resulting to pulmonary embolism- leading to medical emergency.