i need to loose at least 40 pounds before march, i have 4 months. how do i loose it?

Eva

New member
i am 15 years old, and i need to loose 40 pound because i am going to have knee surgery on both knees. the doctor said it would help me recover healthier if i lost at least 40 pounds. currently i am 170. how do i loose this much? help please!
 
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