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More evidence today that our genes aren't always our destiny -- with an inconvenient caveat for couch potatoes: Physically active people who carry gene mutations linked to obesity are no more likely to be overweight than those without the variants -- as long as they exercise at least three hours a day.

But the gene's "obese-ogenic" effect may be turned on by high-fat diets, inactivity or other environmental factors, Snitker said.

Aerobics is a great way to exercise and stay in shape. It gives you an all round workout, toning your muscles, and helping you to lose weight. There are a lot of aerobics classes available and you can find different levels of classes from beginners to advanced to suit your level of fitness. You can do general aerobics classes, hi or low impact aerobics, step aerobics, aqua aerobics and dance aerobics. Classes vary from 30 minutes to 1 hour and are set to music. You'll get a total body workout with exercises for the arms, stomach, legs, back and other muscles. Plus you'll have a hi energy part to the class to help you burn calories and lose weight. And part of the class will always have some stretching to help you relax, stretch and become more flexible. You can find aerobics classes at your local gym, health club and dance studio. Plus you can get aerobics workouts on DVD so you can workout at home or find fitness websites with workouts you can follow online. Take a look at this website to find out more about this great way to exercise and lose weight.Aerobics Exercise from Ways to Get Fit:http://waystogetfit.googlepages.com/aerobicsexercise