I'm not sure if this thread should go in the growth or body expansion sections, so forgivie me if this is the wrong place. I recently discovered a website similar to youtube that features episodes of Atomic Betty.
In one episode, called a woman discovers a jewel that muscles out women into amazons. During the course of the episode, two human girls, Megan and Sarah, get zapped by the jewel and turned into massive muscle bound versions of themselves. Also, Betty's sidekick Sparky gets transgendered into an amazon, too.
http://www.vimeo.com/1724286 This is the link to the video. Girl Power is the second story and starts at about 10:02. Again, forgive me if this is the wrong place for this.
In case anybody doesn't wanna mess with the video, here's a couple of screen caps. One of the girls as they normally look and one of their muscled out forms.