I'm 17 years old and am 5'3'' in height and weigh roughly 108 lbs and I want to get a toned body and most of all I want well-defined abs.I would like to get as close as I can to this in the next 3 months. So I would like to know What is the best way for me to achieve this?

At five three and 108 you are not in a bad situation. To expose your abs you will have to run and burn that extra layer of fat that is covring your abs. cut back tremendously on the sugars, and begin jogging, or swimming. Tennis, and basketball will also help. You will need to develop a daily routine in order to get it done in three months. Please rate this answer.

The way you sound your already the envy of a lot of people, all it takes now is a truly all natural, whole grain, low fat, low sugar, low sodium, diet to round it out, if your eating truly healthy and adbiding by the 1 serving size nutritional size servings, your doing good, all that's left is a overall body exercise program, including, aerobics, resistance training, and weightlifting. You need to work the whole body to achieve the perfect body. This includes various exercises in each grouping for 30-60 minutes a session, 4-5 days a week. A natural whole grain, fruit, veggie and lean meat diet, rich in Low fat, 1-2 % or skim milk, yogurt, low fat, low sugar, low sodium, skim or part skim cheeses, 3-4 servings a day will help. Milk, cheese, yogurt increases fat breakdown in fat cell overweight adults who included 3-4 servings per day of dairy products,lost more weight and body fat. Calicum regulates energy metabolism and increases fat breakdown, and decreases, the amount of body fat. Hope this helps:p

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1) Eat 6-8 meals a day/ sleep well

2) Whey protein/multivit/creatine/flax seed - standard supplements which may help (bare in mind they supplement)

3) Train 4-5 days a week but don't over train - listen to your body

4)

1 day Chest - tris

2 day Shoulders

3 day Legs

4 day Back-bis

5 day extra day for cv - catchup