Blood clots usually appear in the lower extremities, so it is important to keep them ‘alive’ even after a serious surgery. There is a special set of exercises for such patients. Do not let the clot get into the bloodstream, trying to reach other organs and block the major lungs’ artery, or your body will stop receiving enough oxygen. Chronic heart disease, paralysis, or smoking are some other good reasons for pulmonary embolism to show up.