On a long transcontinental flight,a middle-aged man gets up and exercises in the aisle,moving his hands,feet,arms,and legs as much as he can.He does this every two hours.The flight attendant asks him to sit down,but he explains that he is trying to prevent a very dangerous medical condition.He is talking about

Question

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The man is trying to prevent deep vein thrombosis, a condition in which blood clots form in the veins, usually in the legs, due to prolonged sitting or immobility during long flights. Exercise and movement can help prevent the formation of blood clots. Leukemia, aplastic anemia, and thrombocytopenia are all blood-related disorders that are not directly related to the prevention of deep vein thrombosis.

On a Long Transcontinental Flight,a Middle-Aged Man Gets Up and Exercises