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Soooo... you know how when you're in a state of deep concentration, your facial expression can get a bit out of control?
This is often evident in action shots, where the rider is focusing their energies on the bike rather than what their face is doing, resulting in some freestyle gurning...
Not the best example, but enough to get the ball rolling:
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A dose of inspiration:
This guy's in the lead so far:
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[url= http://farm3.staticflickr.com/2559/3830564771_1b622c0e97_n.jp g" target="_blank">
[url= http://www.flickr.com/photos/rocketdog/3830564771/ ]Aug 17th[/url] by [url= http://www.flickr.com/people/rocketdog/ ]rOcKeTdOgUk[/url], on Flickr