Background and Aim: Having a proper posture is one the aspects of good health which has important role in activity of daily living and sport skills. Spine abnormality is the most prevalent disorder and hyperkyphosis is more propagated one. The purpose of present study was to compare the effect of conventional corrective exercise and physioball exercise on improvement hyperkyphosis and vital capacity in girl students.

Materials and Methods: 44 girl students (13±0.83 age) with the hyperkyphosis were participated in this study. Participants did not have any history of surgery, trauma or pain in their limbs. In pre-test and post-test, curvature of the back  measured by a flexible ruler and  vital capacity measured by a digital spirometer.

 Students in terms of the curvature of the back were divided in to three subgroups of experimental 1 (Corrective exercises physioball), experimental 2 (conventional corrective exercise), and the control group (did not participated in any exercise program). The training program was done eight weeks, 3 times per week.

Results: The result of ANOVA showed that there are significant differences between pre-test and post-test. The results of Tokey showed that there are significant differences between both experimental groups compare to control group in hyper kyphosis and vital capacity in post-test. However there is not different between 1 and 2 experimental groups (P≥0/05).

Conclusion: Performance training with physioball and without physioball are useful for improvement of hyperkyphosis and vital capacity in young female students. There is not different between two groups.

Key words: Corrective exercise, Vital capacity, Physioball,  Hyperkyphosis