There must be some Female Muscle fans on the writing staff. They did an Amazon episode in season 2.
Matt Groening himself is huge fan of female bodybuilders. That's why we got "Strong Arms of Ma" on the Simpsons a few years back, and now this on Futurama.
Would have loved to have seen a really massively developed bodybuilder, like the singing cowgirl on the "Strong Arms" epsiode. But other than that it was a great show. Amy in particular was ripped and shredded, and aggressive beyond belief (I actually though Kif would have liked THAT, but he didn't). They actually had a couple of good comparison scenes where Leela far more muscular and broader of shoulder than Fry, and Amy absolutely dwarfs Kif.
Lets hope for more of this in future (-rama
)