There is no doubt that Gymnastics sport is one kind of sports completely depends on large muscles like arm muscles , shoulders .The ongoing changes to the law of Arbitration Gymnastics put further burdens on the training programs makers or authors and on its development , to catch up and follow the progress. And from this we need to develop training programs. Willardson also points out that in recent years the attention of the specialists in the field of fitness has increased to the use of trunk stability exercises .William, Prentice and Daniel suggested that body core consists of a group of muscles known as PELVIC-LUMBER-HIP compels, and they consist of 29 muscles. Also the body core is the center of mass .Willardson (2008) Quinn (2005) and James (2005) they all agreed that body core stability  exercises are from the methods of modern physical training of the body muscles. The basic objective of these exercises is to develop and increase the strength of the deep muscles of trunk.It is considered that the fundamental importance of body core stability training is to control and fix trunk and pelvic joint muscles.The gymnast moves in a way against the gravity, so when the gymnast doing those skills, he needs fixation of the pelvic joint and lower back  .