Old experiments that works.. z lock on calf.. the height of the calf is dependent upon the +/- height of terrain.. of course but I think there’s some more tweak to it to get to the real thing since the calf height is so fix it can’t get the 45 degrees toe action.. like those cat walk thingy but for easy get going it should already worked in physics.. because it already have automated hip sustain while walking tip.. get the calf on z lock.. set toe and foot to dynamic.. and just move the calf or knee with forward sequences the rests it just erecting the spine