The aim of the study was to determine the effect of selected yogic practices on hormones triiodothyronine.20 trained sports men were selected randomly from Annamalai University their age group was between 18 - 25 years. Three groups were formed two experimental and one control group of 20 subjects each. The experimental group-1 participated in yogic practice training and experimental group -2 underwent Calisthenics for 10 week and the control group performed the routine work. The data was collected in the beginning and at the end. The training schedule was prepared systematically and carefully. The significance was tested at 0.05 levels.