Make sure the machine is easy to use. The abdomen muscles are some of the most difficult muscles to work into shape. Not only that, but they're located in the stomach area. This is the place where most of us have a lot of flab. This flab hides our abdomen muscles.
Some people dream of getting rid of flab on the stomach.
The problem here is weight, not weak abdomen muscles. Although ab machines could help increase metabolism, ab workouts on their own are not the most effective way to lose weight. If fat is the problem, lose it by doing regular cardiovascular workouts - 30 minutes a day, three to four days a week. This can include running, cycling, hiking, or swimming. If fat isn't the problem, ab machines can strengthen abdomen muscles.