How to get in shape without losing any weight?

You might not lose weight by exercising, not sure on this though, I can’t see why you’d lose a pile if there’s not much there. There is a potential to gain weight if you do more muscle oriented exercises, as muscle weighs more then fat.

Sit ups, tones your body :)

actually, it’s been proven sit-ups really don’t do much for you

You’re going to loose some weight wether you like it or not. However, if you keep it up, working out, ect, you will get toned. Do sqauts, clings, push-ups, Or try some dancing lessons(belly dance and Latin are the ones I’ld highly recommend for loosing flab). Another helpful tip, if you can, try working out in the pool, for example, try kick boxing in the pool(sounds crazy, but you’re working against the water, and it does pose a challange to do things like that with perfect form).

Best of luck to you 1_~

Having A Shape Is Inherited.