Moving more and eating less leads to weight loss, as long as you keep your calorie intake at a negative balance. A 1,200-calorie-per-day diet creates a caloric deficit for most people, but how much that deficit equals depends on the person.

Weight loss is a matter of eating fewer calories than you use during your daily activities, which means it's possible to lose fat from simply dieting; however, this isn't necessarily the most effective way to lose weight.

How many calories you burn in 20 minutes of circuit training depends on what kind of circuit workout you do. Fitness coach Ben Cohn reports that there are two popular kinds of circuit workout: aerobic and resistance.

Running for 15 minutes will burn a specific amount of calories based on your body weight and running speed. Understanding calorie usage allows you to set your running pace to meet your caloric goals.

When losing weight, the first thing you need to address is your calorie intake. The key to weight loss is being in a calorie deficit, where you burn more calories than you consume.

If you're looking for a high-intensity, quick DVD workout to tone muscles and burn calories, the Jillian Michaels 30 Day Shred provides three intensity levels to work your body. Skip the first level and move straight to Level 2 if you already work out regularly.

If you are using pull-ups to burn calories, you may find your strength giving out before you reach your caloric goal. Pull-ups are not considered cardiovascular activities, which are more commonly associated with calorie burning. They are primarily used to increase strength.

Wearing ankle weights can increase the resistance level of your workout and enable you to burn extra calories. Using ankle weights can strengthen muscles and improve muscle and cardiovascular endurance, but may also increase your risk of injury.

Believe it or not, most of the calories your body burns are burned at rest. This includes while you are sleeping, eating, sitting at your desk, sitting in front of the TV or engaging in any other sedentary behavior.

What you wear when you workout is important. Your attire and gear can help keep you comfortable and in some cases, is very important to the exercise you are doing, like good shoes for running.

Of the three exercises -- running, swimming and walking -- the one that burns the most calories is determined by the time and intensity you do them as well as well as your weight, muscle mass and metabolism.

The start of any diet can be the part of your plan to slim down and get fit that is most prone to failure. As you attempt to establish new habits, your body often wants to cling to the old ways of doing business, and it's possible to gain weight in the first few weeks of your diet.