Giving Blood as an exercise
When you think of exercise you envision walking, running or going to the gym. But what about exercising the inside of your body? Giving blood, if you are capable, is exercising the inside of your body. To replace that blood you gave, your system has to manufacture new blood which maintains that manufacturing system. Then, done on that 56-day cycle, your body is operating on fresh blood most of the time which is good for all your organs including your heart. Second, running on fresh blood you reduce the chance of plaque build up in your arteries and veins which reduces your blood pressure since it takes less force to move fresh blood through clean arteries and veins that reduces the work your heart must do pumping that fresh blood around your body.