The strength of muscles of trunk increased both groups there which indicates that when the work of a real increase in the trunk muscles, which corresponds to the study of the above assumptions supporting Hulst.And that experiment is the strength of the abdominal muscles, the better, because the features in the group. The body will have to bow to the front of a เพิ่อ, the center of mass moves forward. Abdominal muscle requires more than normal shrinkage Back to add to the stability of the trunk Result in increased strength, more than
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