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how much weight would dis make me loose

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okay im 14 years old and im joinin track and I weight about 144 . im 4'9 I wanna be about 115 but my sister weighs 102lbs she is my triplet she is 4'8 should I weight 102 since she is pretty much my height?

first question how much do I need to weight if im 4'9

second quiestion iz we have practice everyday how much weight do you think ill loose if I do track and have practice monday thu friday and I dont end til may??

how much do you think ill loose?