I know a few streches we do for track and baseball... the one danman said is good, and here are a few more. These will strecth your chest, shoulders, lats, biceps and triceps
-put your arm across your chest, like around your neck, and push your elbow back
-put your hand behind your head so you can touch your opposite shoulder, and push down with your other arm
-swing your arms around in cirles, start small, get larger, then go to full range of motion
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My name used to be NewMotoXer, but I no longer consider myself to be "new" to dirtbikes. But my new name doesnt quite fit me just yet.. :)