[eugenesia]

It seems that the grooves pointing towards the centre of the platform make for an unnatural walking gait. At the start of a step, the foot will move inwards towards the line of travel. As the foot crosses the torso, it will move outwards again.

Whereas in a natural gait, each foot moves parallel to the line of travel.

See 2:10 of the video for how the shoes fit into the grooves using plunger pins, and how they move on the platform.

[kristiandupont]

I thought about that too. I can imagine a whole new category of back and knee problems in the teens who grow up with this or similar devices.

[tinco]

Note that at no point in the movement the torso moves up or down, so the forces on the joints/back are much lighter. So wouldn't that make the movement a light unnatural movement like swimming is? Do people get many knee injuries from swimming? (I had a knee injury that flared up when swimming, but I don't think it caused it)