rtable 0.707. There is a significant relationship between the flexibility of the back muscles with the ability to smash the PPAT Club Rumbai sepaktakraw team of rcount 0.713> rtable 0.707. There was a significant relationship between eye and foot coordination and back muscle flexibility and the ability to smash on the PPAT Club Rumbai sepaktakraw team by rcount0.885> rtable 0.707. Key Words: Eye and Foot Coordination, Back Muscle Determination, Smash Ability" />