Attached Link: http://store.daz3d.com/store/merchant.mv?Screen=CTGY&Store_Code=ZP1&Category_Code=ps_Michael

There's an excellent muscle texture for Michael at DAZ3D that should serve for what you describe. You'll meed to have Michael 1 or Michael 2 plus the texture to use it - they can be purchased there. DAZ3D.Com (see link)- There should be a readme with the texture to help you out. (It's called the TJS Muscle Map for Michael, I think) Good luck with your project.