You don't need gizmos and gadgets to get a great abdominal workout, a San Diego State University study sponsored by the American Council on Exercise shows. Researchers compared the results from 13 of the most common ab exercises, some involving equipment, some not. Subjects were 30 men and women, ages 20-45, who ranged from occasional to daily exercisers. The results, from most to least effective:

2. Captain's chair

3. Crunches on an exercise ball

4. Vertical leg crunch

5. Torso Track

6. Long arm crunch

7. Reverse crunch

8. Crunch with heel push

9. Ab Roller

10. Hover

11. Traditional crunch

12. Exercise-tubing pull

13. Ab Rocker

To learn how to perform these ab exercises, go to