Although weight-loss diets may help, the only way to ensure a flat stomach is frequent exercise. Many traditional stomach exercises, however, place excessive strain on the back, increasing the risk of injury. In this guide, international fitness consultant Karen Amen offers effective toning and strengthening exercises that target the stomach muscles and provide a focused, injury-free workout. The programme is equally effective for men and women. Fifteen minutes a day are all it takes, and the results can be seen in one month.