Why do my boobs bounce all of the time?

Like, even when I wear a bra they still bounce and I'm only a 36DD so theyre big but not all that big so Idk. Do I walk weird? Im in sports so I'm in shape but I don't know how to control them and I don't like how bouncy they are. Can someone please give me suggestions?
Why do my boobs bounce all of the time?
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