"Because the abdominals support the body, it is essential that the abdominal muscles be firm, " says Jackie Warner , who agreed to demonstrate her favorite exercises for Plaisirs magazine readers Health. It is living proof that they are effective: look at this size! The six exercises target the muscles of the abdominal strap including the right upper abdomen, the Small and the Large oblique, the Transverse and the erector of the spine in the lower back. Some will help you tighten your arms and legs. Equipment : a mattress, a large towel and a dumbbell of 1.3 to 3.6 kg, depending on your shape. For beginners, begin without dumbbells. Warm-up of the abdominal muscles : Stand upright with your feet spread apart at shoulder width and your knees slightly bent. Place the arms in the boxer position: the elbows are glued to the ribs, and the fists are closed at shoulder height. Throw the right arm diagonally in front of you to reach an imaginary target to the left, and con...