Want to lose weight? Walk, don't run

from execise.about.com

When the subject of walking for exercise and weight loss comes up in conversation, it's amazing how polarizing it can be. Some people think walking is lame because it doesn't burn as many calories as other activities. Other people staunchly defend walking, saying that, if you do it right, you can build endurance while burning quite a few calories.
One reason some people think walking is lame is because our bodies are so good at it. The better you are at an activity, the fewer calories you burn doing it. It also takes a little work to keep the intensity up during walking workouts, while higher-impact activities (like running) are naturally more intense simply because they are high-impact. What's interesting, however, is that when you walk at a fast pace, say more than 4 mph, you burn about the same number of calories as running. That means, if you want to lose weight with walking workouts, you may need to spice things up to add more intensity: More