You have about 6 to 9 liters of blood in your body depending on body size. Your resting heart rate and breathing rate... is your resting heart and breathing rate, about 70 beats/min. At rest most of this blood is in the veins throughout your body, not within your arteries or within your lungs. This is because the journey of blood through your body's veins takes longer than that through your arteries or lungs. During exercise, however, …showed first 75 words of 399 total…

…showed last 75 words of 399 total…like they're working. To calculate your maximum heart rate: Male: 220-Age (Non-athletic) 205-Age/2 (Fit) 214-0.8*Age (Alternative) Female 226-Age (Non-athletic) 226-Age (Non-athletic) 209-0.7*Age (Alternative) <Tab/>If you can't take 50% of your maximum heart rate, then consult a physician and find out what you can do to get into shape. Your heart is what how you treat it so exercise and eat right to keep up your energy and youthful looks.