Weightlifting is a muscle-building activity that can lead to weight loss by encouraging your body to use your excess fat as an energy source. If you use an appropriately heavy amount of weight during a workout, you can lose pounds with increased efficiency. However, performing more repetitions or sets of weightlifting exercises may not increase your weight loss benefits.
Basics
Weightlifting helps you lose weight by increasing the amount of muscle tissue in your body. Compared to other types of tissue, muscle burns through a lot of "fuel" and needs a large amount of calories to maintain normal function. If you control your food intake, increasing the size of your muscles will cause your body to burn off your fat reserves to meet your growing calorie needs. Unlike aerobic exercises, which temporarily increases your fat-burning capacity, performance of weightlifting and other muscle-building exercises provides you with a fat-burning increase that lasts throughout the day.
Repetitions and Weight
When you lift weights, you typically need to perform a certain number of repetitions for each exercise in your routine. The number of consecutive repetitions you perform is a set. To gain the maximum benefit from any given exercise, your sets must contain enough repetitions to fatigue your muscles temporarily and make further exercise too difficult to perform. The amount of weight you lift directly influences the difficulty of each repetition and, in turn, the difficulty of each set. Weightlifters usually use enough weight to limit each set to roughly eight to 15 repetitions.
Effectiveness
If you use enough weight to tire your muscles in 12 to 15 repetitions, performing one set of any given exercise will build your muscles just as efficiently as performing three sets of the same exercise. Since increases in your muscle size correlate with increases in your fat-burning capacity, this means that performing one set with sufficiently heavy weight can provide the same weight-loss benefits as performing three times as many exercise repetitions.
Weight Amounts
The amount of weight you can safely lift depends in large part on your weightlifting experience. If you're a beginner, start with small amounts of weight that will give your muscles and supporting structures time to adjust to the rigors of a new exercise routine. When you can lift a given weight 12 times without fatiguing your muscles, gradually add to the weight you use until you reach a new fatigue point. Consult your doctor and a certified fitness instructor before you begin working out.
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