Walking is one of the simplest exercises out there because most of us do it every day. Starting a walking program is just like beginning any other exercise program.

The amount of calories burned while walking can vary greatly, depending several factors. The amount of time you walk, how fast you go, what shape you're in and even where you walk can make a big difference in the calories you burn. For instance, a 150-pound person who walks slowly on a firm surface for half and hour will burn about 85 calories, whereas a 200-pound person on a cross-country hike will burn 273 calories in the same amount of time. Calorie calculators can help you determine how many calories you're burning.

When it comes to upping your calorie burn, remember to keep your pace up: Walking can burn as many calories as running if you work hard enough. And, don't shy away from hills. They might leave you breathless but you'll burn mega calories in the process. Finally? Head off the beaten path. Hitting the trails on a nature walk burn more calories than city-walking does.

Why should you care about how many calories you burn? Burning more calories shaves inches off your waistline and is crucial for your overall health and well-being.