Hubungan Kekuatan Otot Lengan Dan, Bahu Terhadap Akurasi Servis Atas Bola Vol…

based on observations while in Junior High School 2 Kampar, especially in the accuracy of the service of students. It is seen service on the students do tend to be less focused on the target field plots and also not infrequently balls tend not meleawati net. This problem is suspected because of weak muscle strength of arms and shoulders of the students son SMP Negeri 2 Kampar. Therefore, the ob…