I've been trying to sort out the sloppy mess that is my shimmy. I initially learnt to shimmy the "just shake everything really fast" method and have since been struggling to unlearn and learn the correct/controlled way. So I took your advice and (being the cheap cybergeek that I am) downloaded a metronome programme off the internet. Only this one has an "accelerator" built in so you can speed it up however many bpm you want after however many bars you want. So for example after 4 bars of 4 beats, tempo will increase. Been having a go "shimmying" real slow and speeding it up every day. I wouldn't say I have a full speed shimmy yet but I can see it coming and I've got CONTROL, yay!!!!
So wanted to say thank you for the inspirational idea! Shimmy queen in the making!