Choosing Your Six-Pack: Abdominal Muscles and Pot Bellies :

You've probably seen the advertisements high over Times Square or staring back at you from magazines: the male model casually displaying his rippling abdominal muscles. What you may not have seen is the effort that goes into getting an abdominal "six-pack," the hours of exercise, and often a careful diet.

If your own six-pack is more of the alcoholic variety, or if you have noticed a spread to your abdomen over time, you may be tempted to begin "crunches," those partial sit-ups that make your abdomen burn with pain, or to order one of those heavily advertised abdominal exercise aids. Before you order that abdominal exerciser from the television commercial or apply for a modeling job, there is something you should know — something your personal trainer, health club, and mail-order fitness videos probably have not mentioned. While exercise is generally a good thing, for most of us, the abdominal six-pack probably won't happen.

The Myth Of "Focused Exercise"

It is only logical that if you want to strengthen your arms, exercise your arms; if you want to strengthen your abdominal muscles, do sit-ups. But while exercise directed at one part of the body can certainly strengthen that area and increase the size of those muscles, that does not mean you can shrink an area that you feel is too large (that is, has more fat than you would like) simply by exercising it. The focused exercises for the buttocks, thighs or abdomen commonly recommended to reduce their size will not necessarily lead to those areas getting smaller; in fact, they may get bigger as the muscles enlarge. Basic Accounting and Biology

Two principles loom large when trying to "sculpt" one's body:

• Calorie accounting: To lose fat, one must reduce calorie intake and/or increase energy expenditure so that stored fat is utilized as fuel for the body.
• Biology is destiny: fat cells, whether increased in size, number or both, cannot turn into muscle cells.

Reducing the fat accumulation in one area of the body is not easy. The usual measures to lose weight (including reducing calorie intake, increasing exercise or both) may lead to weight loss but not necessarily in a single area. In fact, short of having cosmetic surgery (such as liposuction), you cannot easily choose the area from which the fat will be lost. This is the reason that some women notice that their breasts (which are largely composed of fat) get smaller when they diet.

And weight loss is more than just reducing "calories in" compared with "calories out." The difficulty many people have in losing weight probably relates to a well-established phenomenon that seems terribly unfair: As you take in fewer calories, the body's metabolism changes, so that fewer calories are burned with normal body function. In studies of persons losing 10 percent to 20 percent of their body weight, "calories out" diminished, despite similar activity levels, which slowed further loss of weight.

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