The research aims to know The effect of functional strength training for muscles center and their relationship To standard performance of changing Level and Penetration Skills for Juniors Amateur Freestyle Wrestling , where the researcher used the experimental method on a sample of (20) Freestyle Wrestling athletes of el shobann el mouslemin clup . and they were dividing into tow groups the first is experimental consists of (10) athletes using functional strength training and the other is control group consists of(10) athletes using the training program and(5) athletes have been chosen from manchiya youth center for the pilot study. the most important conclusion is functional strength training has a positive impact on all physical variables in the research which are [strength muscles – motor balance – Static balance ] and on skills variables which are [changing Level - Penetration] and the positive effect in research variables and this is for in the training process and there are statistical differences for the benefit of experimental group comparing with the control group in all research variables . Keyword: functional strength, muscles center, Core ability , Core strength , Core power, Freestyle Wrestling