Originally Posted by
shouldberiding
High cadence isn't for everybody. If you're bouncing about or getting "whiplash" at 90rpm and higher though, your pedal stroke isn't very smooth. 90rpm isn't a high cadence, relatively speaking.
Practice makes perfect. Concentrate on spinning in a complete circle rather than the up and down portion of the pedal stroke.
I only bounce around when I am in too low of a gear. I started out bouncing but shifting up I was able to run smooth.