What is the best way to lose weight for a teenage girl?

My Body Mass Index is 24.3, which is at risk for being overweight and I really want to lose at least 5-10 pounds and lose fat in my legs. I am thinking of joining a volleyball team and swimming 10-20 laps at the gym 2 times a week. I sort of also want to eat good foods, like burgers once in a while. To lose weight, should I stop eating lunch at school and make my own?

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