Why is my solid ball down performance

I had to throw over 10 meters, 11 meters more. . . I have always been training, but it is still at most only 10.2 meters or so, most of only 9 meters, why my performance dropped the ball solid

---

The more practice the more tired, the body will not stand for -

rest a few days - to ensure there will be progress, ah -

Oh, do not let the body too tired --