This site has very in-depth information about how to perform exercises and what muscles they work. you have to look around to find some but it is interesting.

http://exrx.net/index.html

I just like this one. http://exrx.net/Lists/PowerExercises.html

http://exrx.net/Lists/Directory.html

this one has training programs on the right side.
http://exrx.net/Exercise.html

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