How to lose weight quickly?

I'm pretty chunky and I am only five foot five. I weigh 160 lbs and I am only 14 and I want to have a flat stomach for the summer. And I also have a hard time being on a diet and staying on it. And also I can't do sit-ups or push-ups. Please help.

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Recommended Answer:
There are many simple things you can do. Here is what I would suggest:

1. Vary your caloric intake each day. For example, have 1500 one day, 1200 the next, 1700 the next, and so on. That way your body doesn't adjust to the calorie level.

2. Vary the foods you eat. Eat a great variety of healthy food.

3. Vary your exercise routines. Don't work out at the same time everyday. Sometimes work out in the morning, sometimes in the afternoon, sometimes twice a day, and sometimes skip a day.

4. Vary the types of exercise you do. Don't do the same things everyday.

5. Include strength training/weight lifting as part of your exercise plan, but again don't do the same things everyday,

6. Incorporate as many types of aerobic exercise as you can. Each day vary the time, the intensity, and the type of exercise as much as possible.

7. Eliminate ALL junk food, sodas, pop, sweets, fried foods, fast foods, fruit juices, and processed foods. Everyday eat a healthy diet of fruit, veggies, a few nuts, lean meat and fish, whole grain breads and cereals, low fat dairy products.