I am a little bit of a weightlifter and the average mans body fat is around 15%. The average for women is around 20%. Most people begin to see visible abdomenal muscles when they are around 10% (men) and 15% for women. But that has a lot to do with ones muscle genetics in the first place. I know I don't have those chunky ab muscles so I need to get below 10% in order to see that.
Originally Posted by Helinophoto
Some are "thin" but have such little muscle mass that they are able to carry around ~20% body fat without appearing fat with clothes on. Again, it all has to do with lean muscle mass.
5% body fat is absolutely miserable from what I hear and is not sustainable for more than a couple weeks. Even for men, 5% body fat is insanely lean.