Cant find a place to ride my mountain bike for exercise, were should i look on the net to see whats close.?

http://www.mtbr.com/ has a number of forums you can browse. In the middle of the home page there is a section marked "Trail Reviews" that should help you.

In addition, you don't say where you are from, but there are probably local web sites. For example, for Southern California there is www.geoladders.com.

Huh ? Push it out to the street you live on, get on and start riding !
Adding to Andrew, forums.mtbr.com is the forum section of Mtbr. They have several regional areas where you can ask.
singletracks.com is another good site for trail info.
you could call your local parks and recreation department for a map of biking trails

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