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Structural dysplasia differences were investigated in reference to selected tests of motor ability. A sample of 222 male college students and athletes was used in the study. Anthropometric, lean body weight, and excess fat measurements were taken. Group and subgroup designations were determined by the upper and lower body component makeup of structural dysplasia possessed by each of the subjects. The results generally demon­strated few significant differences between the groups and subgroups in reference to the selected tests of motor ability.