I think you've never been in a street fight before? There are
real arts where skill will negate strength. Like BJJ. A
high-ranking girl will have her way with you once she gets you to
the ground. No matter how strong you are its useless, because when
she gets you into certain positions there's just nothing your
strength is going to do for you.
Also the theory that it's better to use legs than hands, in a
street fight, the person will just rush you, the most you can only
get ONE kick in, then it's all hands from then on. Like I said,
it's not a ring fight, once they close with you, they don't back
off and circle you like in a ring fight. They come in and pummel
and pound and punch.
Get up in time, once you fall, he'll be all over you, stomping on
your ankles, wrists, groin, face, etc. There is no chance for you
to get up unless you are familiar with grappling skills and know
how to protect yourself on the ground. A good BJJ player is even
dangerous on the ground even if you're standing up if its a
one-on-one fight.