Here is a very useful article about creating your own workout.
http://eshlow.blogspot.com/
The author (Steven Low) had previously written a similar article, but this updated one is much more user-friendly than the last one, in my opinion. It's a bit of a read, but if you're seriously going to build your own routine I think it's invaluable stuff. Lots of good information all in one place, well-organized.
He's only got the one post up now, so I just linked to the blog itself.
Peter
Creating your own routine
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