Besides just the obvious practice, I'll try to help you a little more. Keep in mind that I am a bit of a noob to flourishing, so I don't know a whole lot on the subject.
But while I'm practicing, I start slow... reeaaal slow. And then eventually, muscle memory will begin to build. However, once I develop this muscle memory, I don't start going as fast I can. I first concentrate on making the movements flow, and fluid, and all that jazz. Then I eventually keep increasing speed until I get to a speed that I'm comfortable with and that looks good.
Hope I could help!