It is not a secret that stretching exercises improve performance, but in volleyball players due to high individual movements, the effect of this contraction is still not well known. It is worth mentioning that the time of the test and other psychological factors can play an interfering role That should be considered. Understanding whether an effect on their vertical jump can increase the way to improve the warm-up and performance of volleyball players, and this requires more research. (This team is present in the country's league) We randomly divided into two experimental and control groups. Sargent's jumping test was considered to measure the strength of the lower body muscles, which was taken as a pre- and post-test. Descriptive statistical method to introduce Groups and significance level of p.005 were used. Manova statistical method was used.

The important point is that in the control group, some participants recorded better records than the experimental group, but the total of the experimental group recorded better records in Sargent's jump. p>.005 is significant in the experimental group compared to the control group, and stretching exercises can create positive changes in the vertical jump of volleyball players. As mentioned at the beginning, time and psychological factors in addition to genetics and temperature can result For the test to be effective, it is suggested to compare the result of this test with dynamic contractions according to the interventionists.
We can comprise the result of the article to eccentric and concentric contraction to find which one of them is the bestest?