A quick video from Greg Barton explaining hip rotation is at http://www.youtube.com/watch?v=lef_ut8n0ms .
Although you can learn on your own, a good instructor can prevent a lot of confusion and prevent bad habits from forming. Lacking that you might want to study "the forward stroke" DVD by Barton and Chalupsky (the clip above is an excerpt from the video). Brent Reitz has a popular forward stroke video as well.
Cartop Kayak Carriers
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