I’ll try and put something together in the near future (I currently have a few projects that I’m trying to finish up now). One quick trick that I like to use is that I usually start out by roughly blocking out the individual forms and kind of draw the individual muscles from there (by drawing I mean carving the design into the clay/wax). When you block out a form think about the basic shapes. For example the chest muscles in the most simplistic form looks like large squares or bulky rectangles while the abs are a series of smaller squares. This page should also help get you started until I can put together a more detailed tutorial.

Gerald