This is a quick pic that I took of my Wattbike during last years Soreen Challenge at the Manchester Velodrome.
Now looking at the various shapes from that Cyclesport post, I think (and you can correct me if I'm going blind) my shape loosely resembles that of the Peanut...
The Peanut typifies a good cyclist, or someone who naturally understands how to deliver force to the pedals to good effect – people who ride fixed crank bikes naturally have a better understanding of maintaining pedal momentum and often show the peanut shape.
You may beg to differ but I do think my shape is as I say that of a peanut, a deformed one maybe but a peanut nonetheless. In my defence of the deformity I was sat up taking that photo so that may account for the weirdness and whether I stand up to the Cyclesports interpretation of a 'good cyclist' is a matter of debate ;-)