The swim competition is different from other sports. Because the swimmers must overcome the hydraulic pressure, friction, and wave resistance to push them forward. Therefore, the professional swimmers must train their swimming skill and weight training of muscle on the land that can improve their actions and reactions when their arm stroke and leg kick. All of those four swimming competition styles have a range of distances and the swimmers who pay attention the percent of muscular is different. The purpose of this study presents the concepts of water resistance, propulsive force, and weight training. It makes an example to introduce the different muscle groups via upper arm muscles, back extensors muscles, lower limbs muscles, and core stabilizer muscles to provide coach for training practice application.