It Limps! Step 6

It is useful at this point to switch to simulate so that you can see what is happening. Click on construct to show the drop-down menu, then on simulate.

See how gravity takes hold and the creature drops to the ground. It then sways from side to side (like a triffid looking for prey). That is because the two muscles are working together - when one expands the other contracts in time to it. This will give the creature sideways motion, but to actually start to lurch along it needs to be able to pick its feet up enough to overcome friction. We can do that using the central spring...