Guess what? I 'upgraded' your model* by expanding the two sticks by one and adding a stick in the middle of the muscle then connecting them altogether with muscles. Basically I have made your creature have a seizure every time it moves.
I don't know how to see my creatures running speed (on running) but have you looked at the ground and see there are numbers? Well my creature has gone up to 85 in 7 seconds. I don't know if that is fast.