There are a lot of things that can contribute to an effective second serve. Things such as
1. Keep your head still;
2. Relaxed arm;
3. Shoulder rotation;
4. toss the ball a little over your head for good kick;
......
What is the most important element?
I think it is a consistent toss. Without a good toss, even the best service motion won't get you a good serve. Thus if you are not happy with the toss, you should stop the swing, catch the ball and do it again. What do you guys think?
1. Keep your head still;
2. Relaxed arm;
3. Shoulder rotation;
4. toss the ball a little over your head for good kick;
......
What is the most important element?
I think it is a consistent toss. Without a good toss, even the best service motion won't get you a good serve. Thus if you are not happy with the toss, you should stop the swing, catch the ball and do it again. What do you guys think?