I have a firm, round and shapely ass but with cellulite and dimples is exercise the only option?

I have the curve that goes in at my lower back then my ass curves out. Its a good shape but Because I have a bad diet, the bad diet shows with the cellulite and dimples. If I change my diet will this help the skin at least? Or should I do toning exercises too?

I have a firm, round and shapely ass but with cellulite and dimples is exercise the only option?
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