Metabolism

Boost metabolism in the long run with weight training. Muscle burns more calories than fat does (73 more calories per kilogram per day, to be exact) so the more muscle you build, the higher your resting metabolic rate (RMR) will be. Every muscle cell that you gain is like a little factory that constantly burns calories for you, even while you sleep, and revs up when you exercise. This is the only way to increase RMR, which accounts for 60 to 70 percent of the calories you burn daily.

Reference: http://www.wikihow.com/Increase-Your-Metabolism