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.