Just keep your pedal strokes as smooth as possible. Everything I have learned about the rollers is that smoothness is the best thing. Small movements make a big difference. Give yourself some time to get more comfortable. I have been riding the rollers off and on for a month or so, but I still ride in a doorway as I have something on each side of me and I think it makes me more comfortable.
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2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun