How to get a flat tummy?

My tummy has a little pudge to it.I’m not fat or anything like that, its just a little pudge.And I want it to be completely flat for bikini season.Heh heh….*ahem* anyway, so what sorts of things can I do to make it toned up (flat)?

(please be discreptive if you tell something thats not really well known, cuss I’m not that smart.Thank you)