Hanging from your chest harness this four-foot contraption lets you easily advance by raising and lowering the four feet.
The passive mechanical version uses only your strength. It is similar to using crutches, except that they reach high up above you, and you are "hanging" in your chest harness
under them, and there are two "crutches" on each side, one holding you while the other is swinging forward. We'll have to try it out to see if they can be independent of each other or move in pairs, or have a wheel above that turns and places the legs in the correct position.
A robotic version could have the legs independent and then it would be more like a hexapod (spider-like) contraption.