This study aims to determine how the relationship between back flexibility, arm muscle strength and grip to the speed of o goshi technique strikes on judo athletes in judo bandar lampung. Data retrieval using method descriptive correlational. The sample is 30 people with data collection technique Total Sampling. The data analysis technique uses Normality Test, Homogeneity Test, Linearity Test and Correlation Product Moment. The results showed that (1) the flexibility of the back muscles gave a relationship to the throw speed of the technique O Goshi by 31.3%, (2) the strength of the arm muscles give a relationship to the throw speed of the technique O Goshi by 48.5%, and (3) Grip hand give a relationship to the speed of dings technique O Goshi by 37.0%. While back muscle flexibility, arm muscle strength, and hand grip give a relationship of 64.6% to the slam speed of the technique O Goshi. From the results of this study, it can be concluded that back flexibility, arm muscle strength and hand grip contribute to the kicking speed of the technique O Goshi, and the biggest contribution to the kicking speed of the technique O Goshi is the arm muscle strength of 48.5%.