Indicates body-fat rate on the mass of the individual : the higher its value is more the individual is fat, the lower is the drier is the indivual.

Very variable from one individual to another, eMusclor chose to be based on median rates of 10-12% off competition for the men, and 16-18% at the women ; that is to say slightly more (+2-4%) that professional bodybuilders.

During contests, it is possible, and often necessary, cause to drop it (down to 6-8% for the men and 12-14% for the women) so that the muscles arise better, it is what is called to dry. This practice is not without consequence on the wear of the organism : the waste of the body tend to be stored in the lipids, so that they are released too quickly and in too large amount while a too brutal burning.
This is why to go down too low or to participate at too many competitions can prove to be dangerous for your bodybuilder, even if the ectomorphs have a small advantage on this level.

Workout (in particular cardio-training) and the nutrition exploit a fundamental role this criterion.
This rate tends to increase - and drop with more difficulties - with the age, mainly because of a fall d'hormonal activity (testosterone, thyroid…), but also of the AMPK (a protein which accelerates the fat burning).