How to practise for a more consistent toss?

I found that my serve is inconsistent due mainly to a rather inconsistent toss. Appreciate practice tips for tossing more consistently for
토스가 일정하게 되질 않는다. 이것을 일정하게 하는 tip을 알고 싶다.


There's only one way you can improve the aspect of your toss, really.
And that's just standing still, tossing the ball straight up, catching, and repeating.
자리를 잡고, 토스를 하라. 그리고  내려오는 것을 잡아라. 반복하라.