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From Fellrnr.com, Running tips
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Looking at yourself in a mirror is a simple method that can give a sense of body fat. Obviously there is no numerical quantity to this test, but it's cheap and easy.
===Abdominal Muscle Definition===
If your body fat is low enough, the definition in your abdominal [[Muscle|muscles ]] (six pack) can be used to monitor body fat changes. There is no specific body fat percentage for having a six-pack, but the common thought is that you need to be 12-8% for men and 18-14 for women.
