Because most anthropometric formulas such as the Durnin-Womersley skinfold method,  the Jackson-Pollock skinfold method, and the US Navy circumference method, actually estimate body density, not body fat percentage, the body fat percentage is obtained by applying a second formula, such as the Siri or Brozek described in the above section on density. Consequently, the body fat percentage calculated from skin folds or other anthropometric methods carries the cumulative error from the application of two separate statistical models.
On October 21st, 2011, Failheap Challenge Forums  member Aurora148 submitted a thread titled “Anthology of Gender Normative Image Oppression NSFW | CHECK YOUR PRIVILEGE , SHITLORD ,” which received over 1000 pages worth of replies in the next three years. On February 21st, 2012, Redditor thelittleking replied to a /r/SRSDiscussion  post requesting examples of non-bigoted pejoratives with a list of insults starting with the word “shitlord.” On August 12th, Redditor brucemo posted a comment in the /r/TheoryOfReddit  subreddit claiming that members of /r/shitredditsays use the term “shitlord” for “a white man who blunders through Reddit making racist and sexist comments.” On November 24th, Urban Dictionary  user haiyyu submitted an entry for the term “shitlord,” defining it as a insult used by feminists against those who disagree with their beliefs. On March 26th, 2014, the Shitlord Milk Tumblr  blog was launched, which highlights photographs of milk containers with bigoted statements written on the side (shown below).
Essential fat is the level below which physical and physiological health would be negatively affected. Whether a particular body fat percentage is better for one's health; athletic performance can also be affected. The leanest athletes typically compete at levels of about 6–13% for men or 14–20% for women. Body-builders may compete at ranges even lower than these levels. Certified personal trainers will suggest to male body-builders that they aim for a body fat percentage between 2% and 4% by contest time. However it is unclear that such levels are ever actually attained since (a) the means to measure such levels are, as noted below, lacking in principle, are inaccurate, and (b) 4–6% is generally considered a physiological minimum for human males. ( see wikipedia )