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These improvements have a great influence on our physical performance, metabolic efficiency, physical appearance and risk of injury. I'll go into each of these in detail, outlining some very exciting benefits of a good strength-training program that most people overlook or don't realize.

Improved Physical Performance and Appearance

One important result of strength training is increased physical performance. Muscles quite literally utilize energy to produce movement, functioning as the engine or powerhouse of the body. Strength training increases the muscles' size, strength, and endurance, which contribute to improvements in our work, our favorite sports and hobbies, and our general day-to-day activities.

Another benefit of a good strength-training program is its effect on our overall appearance and body composition, which can directly influence self-esteem, self-worth, and level of confidence. Take, for example, a 170-pound man who has 20 percent body fat--34 pounds of fat weight and 136 pounds of lean body weight (muscle, bones, organs, water, etc.) By beginning an effective strength training program, he replaces five pounds of fat with five pounds of muscle. He still weighs 170 pounds, but he is now 17 percent fat--with 29 pounds of fat weight and 141 pounds of lean body weight. Although his body weight remains the same, his strength, muscle tone, and metabolism have improved, giving him a firmer, more fit appearance.

Both our physical appearance and our physical performance can be improved by muscle gain or hampered by muscle loss. Research indicates that unless we strength train regularly, we lose more than one-half pound of muscle every year of our lives after age 25. Unless we implement a safe and effective strength-training program, our muscles gradually decrease in size and strength in the process called "atrophy."

Strength training is therefore important for preventing the muscle loss that normally accompanies the aging process. A common misconception is that as we get older, it is normal to stop being active and to start using ambulatory aides like canes and wheelchairs. Many people think we have no choice; they think this is normal.

But this couldn't be further from the truth. There is absolutely no reason why all of us can't be physically, mentally, socially, and sexually active, living a healthy vibrant life until the very day we die! The reason many elderly people rely on ambulatory aides and become slower and fatter is simply that over the years their muscles are decreasing, so their physical performance and metabolism also decrease, becoming less efficient.

Metabolic Efficiency

That one-half pound of muscle loss every year after age 25 produces a one-half percent reduction in basal metabolic rate (BMR) every year. A reduction in BMR means that our bodies are less able to use the food we consume as energy--thus more gets stored as body fat. Everyone has an individual basal metabolic rate. "Basal metabolic rate" refers to the energy used by our body at rest to maintain normal body functions.

Our muscles have high energy requirements. Even when we are sleeping, our muscles use more than 25 percent of our energy (calories). When you implement the principles of effective strength-training, and if you are consistent in your program, you will achieve an increase in lean muscle mass throughout your body and increase your BMR. In other words, you can actually condition your metabolism to work better and more efficiently even when you are at rest. An increase in muscle tissue causes an increase in metabolic rate, and a decrease in muscle tissue causes a decrease in metabolic rate.

Once again: adults who are not on a safe, effective strength-training program will experience an annual half-pound loss of muscle and half-percent reduction in metabolic rate unless they begin some form of strength training. The gradual decrease in muscle and BMR is related to the increase in body fat that most people gain as they get older if they do not strength train. With a decrease in muscle, less energy is used for daily metabolic function, so calories previously necessary to perform the activities of daily living now end up stored as fat.

You can see that anyone interested in decreasing body fat percentage--and their risk of disease--as well as in increasing physical performance and appearance, should be strength training to help condition their metabolism (BMR).

One of the biggest mistakes people make when starting a weight-management program is not including a strength-training program with their cardiovascular exercise and low-fat eating regimen. This is unfortunate because when we cut calories without exercise, we can lose muscle as well as fat. Many do not choose to do strength training because 1) they mistakenly think they are going to make their body big and bulky, and 2) they do not realize how beneficial and important strength training is in a weight-management program. Whether it is strength, endurance, muscle size or muscle tone (or a combination) you desire, all are very realistic and obtainable.

Decreased Risk of Injury

Our muscles also function as shock absorbers and serve as important balancing agents throughout our body. Well-conditioned muscles help to lessen the repetitive landing forces in weight-bearing activities such as jogging or playing basketball. Well-balanced muscles reduce the risk of injuries that result when a muscle is weaker than its opposing muscle group. For example, jogging places more stress on the hamstrings and calves than it does on the quadriceps, creating a muscle imbalance that often leads to knee injuries; so it is very important that runners be on a good strength-training program that includes training the quadriceps as well as the hamstrings and calves.

To reduce the risk of unbalanced muscle development, you should make sure that when you are training a specific muscle group, the opposing muscle groups are being trained as well (though not necessarily on the same day). For example, if you are doing strength training exercises for your chest, you should include back exercises in your program as well.

By now you have probably realized that weightlifting should be an important part of your exercise routine. Weightlifting provides many important benefits that cannot be achieved by any other exercise or activity. When you begin achieving great results, the excitement and fun you experience will make the change well worth the effort. Action creates motivation! Good luck: I hope you enjoy all the wonderful benefits of an effective strength training program.

Chad Tackett is President of Global Health & Fitness. Learn how you can have your own personal online trainer, dietician and motivator at http://www.global-fitness.com