You know you should walk more. The evidence for what it can do for your health is overwhelming; Walking for as little as 30 minutes a day can lower your blood pressure and low-density lipoprotein (bad) cholesterol, raise your high-density lipoprotein (good) cholesterol, reduce your risk of type 2 diabetes (or help you manage it if you are already afflicted), help you control your weight, put you in a better mood. Everyone from the Mayo Clinic to Martina Navratilova says you should walk.