There are three important components to achieving a "six pack" and they are:
1. Eating Behavior
2. Resistance Training
3. Cardio Training
Keep Metabolism Steady
Eat Breakfast
Skipping breakfast messes up your concentration and other mental functions. The harm of skipping breakfast from a weight loss perspective is it makes you eat a huge lunch since your body hasn't had anything in the past 12 or more hours. When you eat a huge lunch you get that after meal drowsiness so now you're both unproductive and inactive. Try cereals and if you are pressed for time, try breakfast bars.
Eat Smaller Dinners
Cut down on the size of your dinner. If you're hungry, snack on fruits or other healthy, low calorie snacks. Large dinners tend to hurt a fat loss process because most people aren't very active after dinner. Try eating a larger lunch or snacking healthily before dinner. Again, fresh fruits or vegatables are excellent choices for curbing appetite not to mention other benefits; A handful of nuts might do the same. Drink a large glass of water before sitting at the table.
Eat More Fiber
Fiber foods include whole grains, fruits and vegetables, and nuts and seeds. Other options are fiber supplements.
Drink More Water Everyday
Get at least 8 cups of water a day. If you consistently feel hungry after meals, don't immediately think that you need to eat more, you may simply be thirsty.
Just like any other muscle, your abdominals need to be stressed in order for them to build. Muscle is a hungry machine. As you build muscle, your body will require more and more calories to maintain itself. This is true even when you aren't working out. Once you reach a certain level of muscle mass, your metabolism will naturally burn more calories than you normally consume. This effect will continue to trim the fat on your body and help get you closer and closer to achieving that "six pack". The only way your abs will be visible as a "six pack" is if your body is lean enough to allow the muscle definition to be seen. The best way to get lean is to speed up your metabolism. In order to do so, you must build muscle. That is the only way to increase the speed of your metabolism on a long term basis. The best way to do this is weight training for all the major muscle groups. The most effective muscle groups to work for fat loss are the chest, the back, the thighs and hamstrings.
Jogging is a great way to burn fat. Other cardio activities with fat burning capabilities include biking, swimming, jumping rope, playing volleyball, etc...as long as it gets you moving and keeps you moving. A cardio workout should be performed for at least 20 minutes to burn fat. Prior to this your body will simply run on its stored energy, which results in minimal fat loss. An important concept to remember, and one that I will try, is that cardio training should always be done after your weight lifting workout. While lifting weights you use stored, carbohydrate energy, so by performing cardio after weight training your body will have less stored energy to use and go straight into the fat storage for its energy use. The overall best way to shed fat fast is to do cardio (30 minute minimum) right when you wake up. Your body will search for energy to use, and when it finds nothing in your stomach, it will go directly to your fat reserves for energy.
Tips: Same as the 
Tips: Position your feet 2-4 inches wider than your shoulders. Hold one dumbbell in front of your body. Point your toes out at a 45 degree angle. While standing upright, keep your knees slightly bent with your hips in a neutral position. Don't arch your lower back. To begin the exercise, start by moving your hips back like you were going to sit in a chair. Then, bend your knees letting them follow the exact angle of your toes. Lower your body until your thighs are parallel to the floor or to a position that feels comfortable to you. Exhale and return to the starting position. Remember to maintain good posture with your chest up. Also, keep your feet flat on the ground throughout the movement.
Tips: Hold a dumbbell in each hand and pull your shoulders back. Lift your chest up and look straight ahead. Position your right leg forward in a long stride. Your foot should be far enough in front of you so that when you bend your right knee, your thigh and lower leg form a right angle. Slowly bend your knees, lowering your hips so your rear knee just clears the floor. Pause briefly in this position, then slowly straighten your legs and raise your body back up to a standing position. Complete a full set, then switch legs and repeat, or alternate legs for each rep. Make sure your knee does NOT travel past your toes in the down position!
Tips: On a step or platform, (or on your bed if you train at home) lie facedown with hips on the edge of the step, legs straight with toes resting lightly on the floor. (If you are using a bed, your legs will be off the edge and your feet high off the floor.) Squeeze your glutes and hamstrings and straighten the legs until they are level with the hips. Lift one leg higher then the other and alternate. Move each leg as though you are doing a flutter kick in water. Try doing 3 sets of 20 repetitions on each leg.
Tips: Lying on your back with your knees bent, lift your hips off the floor while keeping your back straight. Remember to keep your glutes tight!
Tips: Lie flat on your back with your feet flat on the ground, or resting on a bench with your knees bent at a 90 degree angle. If you are resting your feet on a bench, place them three to four inches apart and point your toes inward so they touch. Place your hands lightly on either side of your head keeping your elbows in. Don't lock your fingers behind your head! Push the small of your back down in the floor to isolate your ab muscles. Begin to roll your shoulders off the floor. Continue to push down as hard as you can with your lower back. Your shoulders should come up off the floor only about four inches, and your lower back should remain on the floor. Focus on slow, controlled movement - don't cheat yourself by using momentum!
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 for added resistance.
Tips: Lie on your back on a decline bench and hold on to the top of the bench with both hands. Don't let your body slip down from this position. Hold your legs parallel to the floor using your abs to hold them there. Keep your knees and feet together. Slowly contract your abs, focusing on bring your pelvis up and in towards your chest Let your abs do the work! Slowly lower your pelvis to the starting position, keeping constant tension on the abs. Don't arch your back inwards while you are at the down position!
Tips: Secure your feet either by placing them under something that won't move or by having a partner hold them. Start in the position shown above, leaning slightly back and clasping your hands in front of you. Moving only at the trunk, rotate to one side. At the end of your range of motion, quickly reverse the movement and rotate to the opposite side. Repeat in a rapid fashion for the full number of reps. You can also hold a weight or medicine ball to increase the difficulty.
Tips: Works your lower abs. Lie on a flat bench with your legs off the end. Place your hands under your butt with your palms down. Put your legs straight out. Bend your knees, pulling your upper thighs into your midsection. Return to the starting position. You can hold a dumbbell between your legs to make it harder.
Tips: Works your lower abs. Place a light weight between your feet if you can. Lie flat on a bench with your legs off the end. Place your hands under your butt with your palms down. Keep your legs as straight as possible and your knees locked. Raise your legs as high as possible. Lower legs back down as far as they can go.
