Abdominal Skin Tightening? (photo)

Hi, I am 35 years old and I am a small size girl, 5'3" tall, 98lb. I don't have too much fat to get rid of, I just want to make the skin tight. I attached two pics, the first one is what I have naturally, and the second one is what I would like to have. Would you please suggest the method is more effective for my case? tummy tuck or exilis skin tightening? Please feel free to suggest other methods that I am not aware of. thank you very much!

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