Being physically inactive, sitting for long periods of time can be so harmful to your health that experts sometimes call it "sitting disease." In fact, worldwide, physical inactivity is estimated to cause some 3.2 million deaths a year.

Medical experts know that regular physical activity reduces the likelihood of early death and death from heart disease specifically for middle-aged people. However, until now, little has been known about the benefits of exercise for older people when it comes to deaths associated with heart disease.

If you are already moderately active, that is enough to make a positive impact on your health, according to researchers. If you're sedentary and become more active-even by taking several short walks around your home each day you can improve your health significantly, and lower your risk of heart disease.

With a healthy diet you can lessen the likelihood of early death through being active and engaging in a healthy diet.