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