Hubungan Kekuatan Otot Lengan Dan Bahu Dan Kelenturan Punggung Terhadap Kemam…

the problem with this research is still a lack of ability back up in a vollyball game the students of smp negeri 27 pekanbaru, this is beceause the flexibility the back is less than the maximum. To boost and create the service for in the in a volleyball game, then take a few element of it is a technique,flexibility,strength, so it could affeect the ability to serve on the vollyball. Research th…