"Jogging is a better way to tighten your thighs and calves, however, walking can give almost the same effect when you "power walk"(walking briskly with arms moving back and forth). Jogging is very healthy for your heart, but for people with breathing and asthma problems, walking is the better option."
"Now, on the statistical side, you will burn more calories by jogging/running an hour versus walking an hour. HOWEVER-you will really like this part-You will burn MORE calories by WALKING a mile rather than running a mile. When you run a mile-you're burning mostly sugars or carbohydrates, which is how your body gives you fast energy; When you walk a mile-you are giving your metabolism time to switch from burning carbs to actually burning fat. "
"If you prefer walking for fitness, you should attempt to walk a long distance. In this way, you might be able to burn off the same amount of calories as running a shorter distance. "
Reference : http://www.helium.com/channels/435-Fitness-Basics
