Building muscle through strength training helps give your metabolism an upward bump. While how much is unclear, one thing is known: muscle burns calories at a higher rate than fat. (Depending on which study you read, a pound of muscle burns anywhere from 15 to 50 calories per day. Compare this to fat, which averages about two calories per day.) Even if you consider yourself an active gal, make sure to incorporate strength training into your fitness routine. Otherwise you run the risk of losing muscle mass. Here are some beginner strength-training moves to get started with.