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Only 33% of the flow technique lucid dreams were prolonged, compared with 90% of the rubbing and 96% of the spinning lucid dreams.[/b]
I've found you can even do it preemptively. In some of my first lucid dreams after I read about techniques and while my lucid dreams were still very rare, I remember starting spinning as soon as I realized I was having a lucid dream, then just repeated this regularly throughout the dream and it worked great, I got some pretty long lucid dreams from it. So if you find yourself in a lucid dreaming, thinking: "Damnit, now I'll probably wake up.", then start spinning like a crazy person. :)