Hi. I am a fat girl. I recently decided that I am ok with being bigger, but I would like to lose about 20 pounds and firm up. I would still be overweight, but I like to think that I will feel better physically. My question is: If I combine strength training with cardio, will my body firm up, just get smaller, or both? I really just want to tone my body some so that I don't feel so jiggly, but I actually like the way my body is shaped.I'm planning on lifting weights, doing aerobic walking, biking more, doing lunges, and sit-ups. I have begun to eat more balanced. Lean meats, salads, water, grains, veggies, etc.

What you are planning sounds great.  Just keep in mind you should do aleast 30 minuntes of cardio 5 times a week.  Try pilates it will help you tone your body but keep your shape. Since it is summer try to do some out doors sports like bike riding or roller blading.  Dont forget the sun screen, protect your skin it is what keeps you looking young. Good Luck!!