These are clearly not cyclists...gross.

[Rebecca19804]

http://surlybikes.com/blog/post/pedal_pumpers (blog source)

Here is a good example of gross ( without being over the top like the Marzocchi pic)
And no, you don't get legs like that from cycling, you get them from starvation.

Even anorexics can cycle. (And I don't think this model is one.)