Saw this as a kid:
  [1]https://www.youtube.com/watch?v=PPcXMg3E9KQ
  and gained a fascination ever since with prosthetic devices,
  especially when they improve human performance In 1998, I bought
  "Kangoo jumps" when they first came out. Paid extra shipping to
  get them from Australia as they weren't available in the USA
  yet, but I belonged to a "Branding" mailing list where people
  shared new brand ideas for import/export for their countries.

  One of the 1st ppl in the US to have 'em and I'd run super fast
  up and down the street.

  It was like prosthetic feet. I still have them; but 17 years
  later, the plastic broke a few years back.

  But point is: Prosthetic arm or prosthetic shoes, I don't see
  much difference.

References

  Visible links
  1. https://www.youtube.com/watch?v=PPcXMg3E9KQ