The term ‘Gymnastics’ derived from Greek word meaning ‘to exercise naked’. Gymnastics develop various component of health related physical fitness such as strength, flexibility, agility, co-ordination, balance and grace. Flexibility is a part and parcel of physical fitness and physical fitness stands on body composition. Actually Gymnastics make a man complete. One hundred (N=100) school girls of Howrah District, West Bengal were selected at randomly as subjects for the present study. The age limit of the subjects was 10-12 years. All the subjects were divided in to two equal groups such as Gr. G and Gr. C. Gr. G was experimental group who were practiced gymnastics activities and Gr. C was control group. Initially Flexibility measures in various joints in the body, Body Composition (Such as BMI, % of body fat and LBM) measuring equipments were employed to all the subjects of both the groups and thereafter specific gymnastic activities were given to Gr. G for three days in a week and continued one six and finally the subjects were retested on criterion measures. The data were analyzed by t-ratio to find out the effects of the treatment. The result of the study showed that the all flexibility measures and body mass index, % of body fat and LBM were improved significantly among gymnastics group but lean body mass was not improved significantly after six months yogic treatment.