How come I have an Inconsistent ball toss?

The ball toss has to do with two things, the rhythm of your arms and the weight of your body when you release the ball. in tennis your weight needs to be back when you release the ball. This will help the ball pitch be consistently above you and be in the right position. if your weight is rocking or traveling back or forward as you release the ball, you will have inconsistency in your ball toss. The timing is very important for success.