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Height and body mass were assessed to determine iBMI and BMI, percent body fatness was determined from skinfold measures (tricep, subscapular) using the Slaughter et al. (1988: Hum Biol 60: 709\u2013723) regression equation and cadiorespiratory fitness (CRF) was assessed using the 20\u2010m shuttle run test. Capillary blood sampling was used to determine: Total cholesterol, triglycerides, high, and low density lipoprotein. These were combined with measures of systolic blood pressure and waist circumference as <jats:italic>z<\/jats:italic>\u2010scores. Metabolic risk (MRS) was constructed by summing the <jats:italic>z<\/jats:italic>\u2010scores.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p>iBMI and BMI were both significantly related to percent body fatness, CRF and MRS (all <jats:italic>P<\/jats:italic> = 0.005 or better). BMI was not normally distributed (<jats:italic>P<\/jats:italic> = 0.0001), whereas iBMI was (<jats:italic>P<\/jats:italic> &gt; 0.05). Regression analysis identified that iBMI and BMI, both alongside for age, were significant predictors of percent body fatness, CRF and MRS (all <jats:italic>P<\/jats:italic> = 0.005 or better). Compared with BMI, iBMI was a similar predictor of CRF, MRS and body fatness.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions:<\/jats:title><jats:p>iBMI offers a biologically sound alternative to BMI to assess the effect of weight status on MRS and CRF in adolescents and allows appropriate use of parametrical statistical techniques without changing the conclusions drawn from such data. Am. J. Hum. 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