Hi I am a 16 year old female. I am overweight and i want to change that. My cousin is a marine and i admire him greatly. I know i want to be a marine. I have wanted to ever since i was a little kid. The only problem is i am overweight and out of shape. I am a junior in high school. do u have any tips on how i can lose weight and get in shape by the summer i graduate 2011?