I have this super complex thing that I made, which I call my fat bull. I am new both to this site and to making gifs, so if you could give me any feedback on adding stuff like gifs, that'd be very appreciated. https://giphy.com/gifs/selfmade-evolution-YBJ1nu4MoFJRvXhDmQ

This one run the fastest for me.
I tried a version with knees but it just won't work, their knees were too weak.

https://giphy.com/embed/WwpD20BvqFpNnx4XB0

There are two versions of this creature, one where it uses its legs, and this one...where it launches itself using some weird physics glitch that it learned to exploit. Sometimes it cripples itself, other times it lands, rolls onto its "head" and flails its legs in the air to move because logic.

Here's mine. After 400+ generations it kinda stayed moving like that

Fastest 4 legged runner, I think.. 

This is my creature I call "Runny Boi" Its pretty simple and does an okay job of running. It has a fitness of about 22% Runny Boi Gif

I made a tiny square that just rolls around. 4 joins, 4 bones, and 8 muscles!