Help! How to loose weight before school starts this august?

BeautyIzHerAddiction
Me and my sister are trying to loose weight before school starts. I weight 170 and im 5'2 my legs and stomach are really chubby. And she is 5'9 186 And tall and chubby. Is their anyway we can slim down in 2 months before school starts. I also want to gain muscle too. I wanna lose 15 pounds. Is it possible and how.
Help! How to loose weight before school starts this august?
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