I'm 5'6" - 34C 26 38 and weigh about 135 pounds..Any good exercises to pull

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down the butt size? i do cardio, planks, crunches regularly..are there any butt specific exercises that will help me tone it down? i know running is good..and i do that almost every other day 3 miles/20 minutes
i heard situps make ur thighs bigger? correct me if i am wrong please