Tips: Using a decline bench, position yourself with your feet locked in at the top. Your upper body should be raised off the bench so that you have to contract your abs just to stay in place. Place your hands on each side of your head, over your heads. Don't lock your fingers! Raise your body slowly while you contract your abs. Crunch up until your elbows are on either side of your thighs. Hold and flex your abs, then slowly lower your body back to the starting position. Don't lower your body all the way down the to bench! If you can, hold a weight plate across your chest or on your forehead for added resistance Tips: Kneel below a high pulley. Grasp cable rope attachment and place wrists against the head. Flex hips slightly and allow the weight to hyperextend the lower back. With the hips stationary, flex the waist so the elbows travel toward the middle of the thighs. Return and repeat. Tips: Start on your knees with your hands about shoulder width apart on a barbell that is positioned in front of you. Slowly roll the barbell forward as far as you can comfortably go. Keep the body locked in a straight position with no back "sag" when in the bottom position. Do not touch your chest or any part of your upper body to the ground. Slowly pull yourself back up using the same motion but in reverse. Repeat. Can also be done with an ab wheel or on your toes. Tips: This is like a situp or crunch, but the machine helps you to add resistance for greater strength increases. Follow the directions on the particular machine that you choose. Be sure to go slow and concentrate on using your abs to push the weight while relaxing your legs and feet. Tips: This is a great exercise for really hitting the abdominal wall. If you want visible grooves and cuts in your abs this is an exercise that will hot them hard. Perform as you would a standard crunch, but place a loose plate or heavy object behind your head as shown.