When doing suburi with bokken, you're supposed to "freeze" your strike when it is aligned horizontaly with the mat (at least in Iwama ryu, I've seen other styles that does the suburi differently).
Anyhow, when I stop my bokken, it always "shakes" a little bit. But when my sensei does it, even with lots of speed, he always manages to stop it without it "shaking" at all.
It's just like hitting pause on a movie.
Question: Does anyone have a good tip or, even better, a good exercise to improve my suburi? I know time will make me improve, but I want some hints anyway.