When I started playing in college, I remember feeling frustrated that I couldn't move my body the same way that some players that I looked up to did. After many failed attempts at practicing my form in front of a mirror in my dorm, I decided to watch a video in slow motion of one of my favorite players and deconstruct his basic strike (Can anyone guess who it was?). Afterwards, I would practice in front of the mirror and move very slowly, trying to match the player's angle, grip, lines, and speed. What I found was that subtle differences in form could have a major impact on my strike.
I try to keep this in mind when I teach taiko. When I deconstruct a pattern, I play it at a painstakingly-slow tempo and have students try and mimic my movement as closely as possible. I often stop and adjust their arm angle, wrist position, or posture. Deconstructing a pattern while playing slowly shows students how their technique is specifically different than mine- my arm will be in a different position than their arm at a given time, their body will not be as straight as mine, etc.
This also allows me to give very specific feedback about their playing, instead of saying something like, "play more fluidly."