Why is it when girls work out they wear a regular bra and a sports bra when they have small breasts?

SpoiledJeano
See the question. Why do they do it? They don't need extra support and I think it'd be so uncomfortable!?

I asked people on my track team and they avoided the question...
Why is it when girls work out they wear a regular bra and a sports bra when they have small breasts?
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