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In episode 14 season 3 of My Hero Academia we've seen that

> Midoriya develops an attack with his legs because his arms get broken more
> easily when he uses One for All

Why are Midoriya's arms weaker than his legs and get broken more easily?


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2018-07-14T17:22:21.500
47828
2021-04-18T21:54:59.947
2020-04-08T16:12:45.407
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my-hero-academia
Why are Midoriya's arms weaker than his legs and why do they get broken more easily?


You are missing important thing - Mydoria had never used 100% attacks with his
legs.

Mydoria was breaking his arms only when using 100% attacks, and since he was
not aware of other ways to use his power early in story, it was happening a
lot. Eventually this led to serious damage on his arms, up to the point when
any further usage of 100% attacks would cause permanent damage.

This is why he has started to think about alternative ways to fight, and ended
up using his legs. But with legs, he was using Full Cowl and iron soles from
very beggining.

Therefore, I think it is not fair to say, that his arms are weaker than his
legs, as he started to use those in completely different circumstances.

Update: actually, good example of his legs being as fragile as his arms is his
academy entry exam - when he used his legs to jump, they've broke just as his
arm he used to hit the enemy.


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2018-07-16T06:42:05.900
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2018-07-16T07:23:18.553
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From the start of season 1, Midoriya always used his arms, but since he is not
able to control power output that caused his bones to shatter all the time.
With the help of Gran Torino he was able to develop Full Cowl, but that was
not enough. His fight with Muscular was a prime example of that. Thus he again
shattered his bones multiple times in that fight, and that was the "wait stop"
point for him.

The human body can fix fractures like that to an extent, but he was using this
again and again. So much that even Recovery Girl said "I can't fix you next
time."

Therefore, if he continues to use his arms with uncontrollable power output,
they will break to the point of him not being able to use his arms. With the
help of Full Cowl, Midoriya can use 20% of his power now, but that's a recent
power up he got. To not risk his arms, he decided to find another solution or
fighting style. Using his legs was the answer.

In conclusion his arms weaker than his legs because he shattered his arms so
many times.


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2018-07-16T07:10:17.820
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2020-04-09T17:48:44.830
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Human legs are naturally stronger than arms. This is something I already knew,
but to back up this claim I checked
[wikipedia](https://en.wikipedia.org/wiki/Kick):

> As the human leg is longer and stronger than the arm...

While I was watching the show, I was given the impression this was the reason
he switched to Shoot Style, not because of his arms being repeatedly broken
and thus weakened. The [_My Hero Academia_
Wiki](https://bokunoheroacademia.fandom.com/wiki/One_For_All%3A_Full_Cowl_-
_Shoot_Style) backs up my memory (emphasis mine):

> To use Shoot Style, Izuku concentrates Full Cowl's effects in his legs
> rather than his arms for his smash attacks, enabling him to use their
> **naturally** greater power to improve his striking strength.


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2020-04-08T15:57:29.253
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