Body composition measurements are a good way to follow an individual's training progress. To compute body composition for adults with Down Syndrome, the Durnin and Womersley (1974) and Jackson et al. (1978) generalized regression equations that should be used. For women, the Jackson et al. (1980) generalized a regression equation that should be used. Kelly and Rimmer (1987) also developed a regression equation for estimating the percent body fat of adult males with intellectual disability. The equation is: % Fat = 13.545 + 0.487 (waist circumference, cm) - 0.52 (forearm circumference, cm) - 0.155 (height, cm) + 0.077 (weight, kg).