Can i play wii fit does it work?????ten points!!?

ive had wii ft since it has come out and i want to lose some pounds im 11 and dont say your so young bla bla bla i jussst want to get rid of my fat rolls im skinny Iwant to lose my muffintop but nothing else because if loose weight anywhere else i will look anorexic.ats about the only fat on my body i not really an athletic person but im very muscular i also eat alot i mean ALOT of junk food and i want to stop i like my body now i dont want it worse but i hate my muffin top