Here's a couple of videos from a two day tour in Socorro NM,
First was a hill climb

and one of the XC race.. The video only covered one lap.

The XC doesn't have a nice "finish" ending - the bad thing about the GoPro is it's hard to tell when you turn it off and on. Some times you think you turn it on but you really turned it off. It has a flashing LED and sometimes I look at it when it's in the off part of the flash.