ABSTRACT.Thirty‐one subjects were trained with weights for seven weeks. At the end of the fourth week, 24 subjects were randomly placed in the treatment‐placebo group which took two capsules daily from 24 numbered bottles for 21 days. Twelve of the bottles contained 5 milligrams of methandrostenolone (Dianabol) per capsule. Oxygen uptake, sperm count, maximum weight lifting and thickness of skinfolds were determined. Also used were cable tensiometry and anthropometric measurements. There was no significant change in oxygen uptake or spermatogenesis. The strength of the treated subjects increased significantly, their mean weight gain was 2.37 kilograms with no significant change in skinfold thickness. Five of eight anthropometric measurements increased significantly.