Survival of the fittest.  Knowing your cardiovascular fitness, and improving it, can help you live longer and better.
D000328:Adult; D000368:Aged; D002318:Cardiovascular Diseases / Q000517:prevention & control*; D002319:Cardiovascular System; D015444:Exercise; D005260:Female; D006801:Humans; D008017:Life Expectancy; D008297:Male; D008875:Middle Aged; D010809:Physical Fitness