good morning all
Here is my experience with exercising as a bigger person: you will look pretty much like you do now, only somewhat better. You will see tone, some definition after some amount of time. My body = takes six months to see much difference. You may lose some amount of inches, but probably not much weight, unless your diet is modified greatly.
When you are cutting calories, you will see more decided differences. I heard a comedian say one time: I've got a size 8 under all this fat; i don't wanna scratch it! And that's about right - fat covers up most muscle definition! I say, get it anyway, if it's not an arm and a leg. Core exercises are very important for your overall health! Just don't expect miracles. Good health benefits like core strength can be more subtle, but still be very important as losing weight! EDIT: Now wait a darn minute - I just looked at your profile. You are NOT big at all. Looking great!