Everyone needs to be physically active to become -- and stay -- healthy; no excuses. It's recommended that adults participate in two-and-a-half hours of moderately intense aerobic exercise, such as brisk walking or dancing (or one hour and 15 minutes of vigorous aerobic exercise, such as swimming or running) every week, plus strength training exercises twice a week [source: CDC]. At minimum, aim for 30 minutes of exercise every day. A leisurely stroll doesn't count -- get your heart rate up to make it count.
Regular exercise can help reduce your chances of developing chronic conditions and age-related illnesses, including cardiovascular disease, as well as bone thinning and loss of muscle mass -- or at the very least help to reverse or reduce the symptoms. This can all add up to fewer aches and pains and increased flexibility and mobility as you age, in addition to keeping insulin levels low and your heart in good condition.