Bionic legs or mechanical prosthetic substitutes for the pedal extremities, started out so normally. Now, however, an advertisement for a futuristic soccer boot takes our imagination to a new level.
SF fans remember the Bionic legs from the novel Cyborg; these devices were essentially a substitute for human legs that fit in the same space and had a similar form. A bit later, Neal Stephenson wrote about a way that people with legs could get a bit of a boost; read about the pedomotive from The Diamond Age.
In the real world, things were moving along as well. Powerisers were patented just a few years ago.
Pole-Dancing Stripperbot Robot
'Why, a clockwork dancer, or, better still, one that would go by electricity and never run down...' - Jerome K. Jerome, 1893.
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Tumblin' Tumbleweed Rovers To Eplore Mars
'His sensors out and working, and the whirring of the tape that sucked up sight and sound and shape and smell and form...'