According to her website, Khloé Kardashian is so into fitness that she's even figured out how many calories a person burns during sex. Us Weekly posted this important fitness information taken from the reality star's website (which can only be viewed if you have a subscription).

Kardashian, the author of Strong Looks Better Naked, wrote on her site: “I even found this ‘sex calculator’ that tells you exactly how many calories are burned between the sheets based on your gender, weight, position, style (‘slow,’ ‘frisky’ or ‘fast and furious,’ haha) and time frame.”