Honda recently had a media extravaganza in which they demoed their recently announced "Stride/Bodyweight Assist Machine", an experimental device that aids human walking by reducing stress on joins and muscles. It's a cross between an exoskeleton and a chair - the former because it's powered and aids your movement, and the latter because you sit on it, and it doesn't require cumbersome straps and fixtures to stay attached to your body. The smaller "Stride Assist" weighs 6 lbs and the larger "Bodyweight Assist" weighs 14. The former, after getting used to it, seems to quite natural.
Honestly, the first few steps felt awkward and a bit otherworldly. However, the prototype is designed to learn how you walk, at the same time as you're learning how to walk with it. Within a few moments, I was walking quickly down a hall and then even running back through it. All of my actions felt natural, but improved, compared to my normal gait and running style.
The device anticipates your walking motion and aids you. It aids muscle activity and is designed for people with limited mobility - those than can stand, but have trouble walking.
The larger cousin of the Stride Assist, the " Bodyweight Support Assist", wasn't nearly as "transparent" but still would allow a great many impaired people have a greater range of mobility.
Video of the Stride and Bodyweight Assist below.
Bodyweight Assist
Stride Assist