726 reactions · 287 comments | Comment the word “PDF” to receive the free pdf Almost 80% of the power on your serve comes from the arm action, only 20% comes from the legs… That’s not to say the legs are not important, since they are a vital component. But it’s more important you develop a good arm action first, and then add the legs to that! #tennis #serve #tips #reels | Online Tennis Instruction | Facebook