HIIT for smaller thighs?

I am not very good at doing cardio for prolonged periods of time...every time I try to make myself do a 45min run or elliptical workout I get really discouraged and turned off by exercise in general. Would doing HIIT make my legs bulky? I really just want to get fat off of my legs. I was going to alternate between doing HIIT and pilates but I have heard that sprinting can make your legs bigger.

What is the truth?
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Thats sort of what I'm going for

HIIT for smaller thighs?
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