FOOD. It's our energy and enemy all rolled into one.
The smartest thing to do is change what you eat.
I'm 26, 6'1" and 170 lbs. You can work out your abdominals until you're blue in the face, and cows fly with pigs...if you don't eat right, you're never going to see that six-pack.
Here's my story- it started 6, almost 7 years ago.
I cut down to the point I cut OUT all things high in; cholesterol, sodium, fat, fried foods and sugar.
First you have to eat balanced foods over the course of your day. I'll tell you right now, stop eating ice cream, cookies, cakes, pastries, hot dogs, candy, chocolate, and EVERY other empty calorie food-like product out there...You want to spend money on the 'Golden Arches'? - Donate to the Ronald McDonald House once a year, and STOP eating FAST FOODS.
Thirsty? - Water, forget soda, forget Gatorade, drink water, or VitaminWater-like products, water with benefits.
Eat breakfast. - A WHOLE breakfast, trash the pop-tarts, and pick up an egg, and a bowl of a healthy cold cereal, or hot cereals in the colder months - oatmeal, grits, cream of wheat, toast-WHOLE WHEAT bread. NEVER buy another loaf of white bread ever again. Take a multivitamin with a glass of juice. Then, over the course of the day, snack on healthy foods, a pair of fruits and a bottle of water, a peanut butter and jelly sandwich on whole wheat bread, or better yet - lean, turkey breast on whole wheat with lettuce and tomato. After work, don't drink beer anymore - just don't. Dinner - SKINLESS poultry - grilled - not fried.
GREEN veggies, yellow, and orange and whatever other colors...are carbs or starches, not vegetables.
Dinner should have a meat entree, a healthy serving of veggies, a moderate helping of carbos, and for dessert - FRUIT!
Stop eating entirely for the night, 2-3 hours before you put your lights out. This helps the body begin to feed off of your stores...sugars and fats. A tip on if you're doing it right...you should feel a grumble or two from your belly, and it's safe to rap on your stomach like a drum or bongo, and you don't get queasy from doing so.
This, with a healthy routine of exercise should do the trick. A tip on the exercise too - if you're always doing the same routine, and you can't remember how long you've been doing it for - you've been doing it too long! Time to change it up a bit. Change and variety is what gives the muscles a charge and surprises them into doing more work for more effect. You've come to a plateau for muscular change if you take your routine too easily. Rotate your pattern, add a mile, try faster sprints in between miles...anything that will kick the muscles a surprise.