When playing sports, shirt gets tucked under boobs?

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New member
Whenever I jump up or lift my arms high while playing sports, my shirt tucks under my boobs, and I always have to pull it out again. It's kind of embarrassing to have to pull it out after every time I jump. This happens to me a lot, and I never see it happening to other girls playing sports. Is there a secret I am missing out on or am I just bustier than them? (And yes I use a sports bra).
 
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