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The Willoughby athlete weight is calculated by dividing the cube of the height (in inches) by 1906 [Thanks to Konrad Balcerak for spotting a mistake in the text prior to August 2006]. The Willoughby athlete waist is calculated by multiplying the height by 0.4584.

David P Willoughby, who was a champion body builder in the early twentieth century, performed extensive anthropometrics measurements on highly-conditioned (male) athletes and found a direct proportionality between waist and height. His ideal form had a WHtR of 45.8%. Willoughby also tabulated data for the morbidly obese, and found the same proportionality between waist and height, but with a WHtR of 57.7%.

Interestingly, although in the Metropolitan Life Tables the weight values are proportional to the square of the height (in accordance with the calculation of Quetelet's Index or BMI), in Willoughby's data the weights are proportional to the cube of the height (in accordance with Rohrer's Index).

The Willoughby athlete weight is then the average ideal weight for male athletes; strength-trainers may weigh more, while endurance athletes will weigh less. Are you a Willoughby athlete? A check on this is to compare your waist measurement to the Willoughby athlete waist calculation.