body fat

how do you guys measure your bodyfat? around how long would you have to do elliptical orrrrrr stairmaster thing to lose 1 percent of bodyfat for a 13 year old? eh? k thanks
 
1 percent is allot, and will take time, and a proper diet.

the best way for you to get your body fat would probally go the the doctor, or get a pair of calipers and do it your self.
 
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