Bodybuilder clothes:
http://www.insimenator.org/index.php/board,719.0.html (link to the main area)
Huge Bodybuilder, Bodybuilder, Slim Bodybuilder, Teen Titans - Bodybuilder Teens, SynapticSim's Lean BB + TBW_459, BBM Teen Project. Also look in the "Guest recolours & add-ons"
Googling "
sims 2 bodybuilder clothing" brings up a whole lot of options, too.