Update to Tracey Staehle Worksheets

I've added the details from the excellent new workout Circuit Zone to the Tracey Staehle weight worksheets. You can find them on the Fitness Tools page. I updated both the Excel spreadsheets and the Word version.

Also, here's a handy link to Tracey's forums, where she talks about the weights she and her background exercisers used. She emphasizes that each person should find the weight right for his or her own body, which is why she wasn't too specific on the workout about weight sizes.