How can i achieve a flat tummy, healthily, and fairly quickly?

Abs start in kitchen: Abdominal muscles start in the kitchen. You need to eat a high protein, low fat diet. Exercise regularly. Hope this helps.

Diet & exercise: Make sure you exercise 90 minutes a day, don't skip meals, avoid soda, juice, dairy, alcohol and fried foods. Eat a healthy well balanced diet! also water, organic vegetable broth, green leafy vegetables, natural pickles, apples are great to fill you up so you dont feel hungry and they are very low in calories.