Kontribusi Power Otot Tungkai Dan Ekstensi Tungkai Terhadap Hasil Service Ata…

The problem in this research is when the service is not optimal, uses strength, does not have good flexibility, the ball is often involved in the net, the ball in service is not properly aimed, the ball is out of service field line, the ball is service is easy to accept for opponents and when doing service, the body or body of the teck often does not follow the direction of the foot falling…