26649


I know that Kyros is a legendary gladiator from Corrida Colosseum who was
turned into a toy by Sugar. He cuts his left foot off to save King Riku (if
I'm not mistaken). But, how can he run so fast with only one foot? Even when
he is a toy, he can run quite as fast and in a human body, he can take the
stairs to Flower Hill faster than Luffy. How can it happen? Is he using
something like Sanji's Sky Walk or CP9's Geppo?


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2015-10-07T01:59:21.760
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2019-11-06T20:38:00.667
2015-10-07T06:50:27.500
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question
one-piece
How can Kyros run so fast?


The physics behind walking/running is:

[![enter image description
here](https://i.stack.imgur.com/AbhDV.jpg)](https://i.stack.imgur.com/AbhDV.jpg)

Kyros has a much sturdier and bigger body as compared to luffy and hence the
action and consequently the reaction force on him increases. Instead of
running, he is actually leaping, and his leaps are consequently bigger, which
makes up for the loss of his leg.

Even if people are of comparable sizes, I believe that a one legged person can
run just as fast as (or only a tad bit slower than) a two legged person. The
main problem that we have when trying to run on one leg is keeping our
balance. Kyros has been 1 legged for a long time and hence, clearly doesn't
have a balancing problem. This may also be a factor contributing to his fast
speed.


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2015-10-16T08:48:28.603
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answer


While it's interesting, I do not agree with [Ashishgrup's
answer](https://anime.stackexchange.com/a/26649/50667). What he shows is only
one step of the entire run movement. It can be entirely decomposed like
[this](http://100photos.time.com/photos/eadweard-muybridge-horse-in-motion):

[![enter image description
here](https://i.stack.imgur.com/Oug2J.jpg)](https://i.stack.imgur.com/Oug2J.jpg)

You push on one foot (steps 3/4), leap (step 5), push on the other foot (step
6/1), then leap again (step 2) and back to the starting position.

If you miss a leg, you are basically leaping four steps and pushing during
only two steps! No matter how sturdy you are or how big your muscles are, if
you have only one leg, you can push yourself forward only half as often and
thus half as fast as you can with two legs.

I think the greater contribution comes from the fact that Kyros does not have
to wear the weight of the missing leg. What he misses is
[almost](https://exrx.net/Kinesiology/Segments) 10% of his entire full-body
weight or - given his size and stature - around 9 kg or 20 lbs!


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answer