Body Detail Help

I need some more body details as in way more muscules, and way more fat becaue I am doing a presentation on what happens when we use steroids and overeat. Are there any other free programs that might have what I nee.
modelling of 3-Dimensional characters
http://www.makehumancommunity.org/forum/
http://www.makehumancommunity.org/forum/viewtopic.php?f=8&t=229