Walking is a great way to fit in exercise for nearly anyone at any level. You can walk around your house, around the block or even walk a 5K race. Walking is good for your heart—it can help reduce high blood pressure and high cholesterol. It's also a great low-impact activity for your bones and your joints and can help reduce your risk for osteoporosis. Walking regularly can also help you lose or maintain your weight, get better and more regular sleep, reduce depression and help you to think more clearly. How many calories you burn walking at 3.5 mph depends on your speed, weight and gender. You can see how many calories you burn walking at 3.5 mph (17 minutes per mile) using the calculator below. If you plan on walking more vigorously, you can check your calories burned here.