aldabbagh, M., & Al_Mashhadani, A. (2014). Effect of Specific Endurance Exercises By Divided The Body In to upper and lower Style on a number of Physical variables and achieving in (50) meter Breast stroke swimming of juniors. Al-Rafidain Journal For Sport Sciences, 20(65), 117–144. https://doi.org/10.33899/rajsport.2014.89575