Strength training helps you burn calories four ways:
1. Calories burned after the exercise stops. Excess Post-exercise Oxygen Consumption (EPOC) occurs after the workout. After running your body replenishes sugar stores. Strength training produces a larger post-exercise calorie demand as the body replaces sugar and rebuilds muscle as a result of the micro-trauma that has been imposed on the muscles.
2. Added muscle burns additional calories. Muscle is metabolically expensive to maintain and will require calories 24/7.
3. The workout itself. All forms of exercise burn calories, but not really as much as people think. Those who exercise with lesser intensity will burn less calories that those who exercise with more intensity.
4. Existing muscle. Existing muscle regularly strength trained will experience an increase in tone and an increase in resting metabolism. You burn more calories 24/7. Running does not produce a similar result. For more on existing muscle burning more calories see this post.
Not only will stronger people burn more calories at rest, people who are stronger can engage in more activities and do them for longer periods with less chance of injury creating a beneficial cycle of fat burning. Strength training is something to consider if one is looking to lose weight.
For those will little free time you might want to consider high intensity training (HIT) for strength. One study examining the effect of high intensity strength training on metabolism showed a nine-fold improvement in fat burning. High intensity training is the type of personal training we do at Austin Fitness Training and at New Orleans Personal Training. HIT is only performed once or twice a week for about 30 minutes. This will free you up to do other calories-burning recreational activities. It is a win, win, win ... proposition.