I'm having trouble with consistency, especially on second serves. We all learn many technical points necessary to hit a good, let's say, kick serve. But obviously we can't think about more than one or two things when hitting. So I'm asking: what is the ONE tip you keep in mind while hitting your serve, to make sure it lands in, with enough pace? For example, it could be ''don't forget to push with your legs'', or ''hit the ball from 7 to 1 o'clock'', ''relax your arm'', ''pronation, pronation..'' etc. What simple reminder works best for you?