in karate muscles mostly used are leg and arm muscles
Karategui
It is based on Okinawan Shorin-Ryu Karate-do.
Karate is an Okinawa/Japanese word that is used as is to name the art in other countries. The Germans call it karate, as to almost all other countries.
he uses karate skills, actually not only karate but also uses the power of his foot.
Yes, Alex Rider used mawashigeru karate.
Shorei-ryu and Shorin-ryu
No the swan stance does not come from the Karate Kid. There is no swan stance. What you are probably thinking of is the Crane Stance that is used in the Karate Kid. It is actually seldom seen in karate and is a Kung fu stance.
Kinetic
I believe you are referring to the Makiwara. It is a flexible board mounted so that the top is about chest high. Karate practitioners punch it repeatedly to improve their technique and strength.
Sort of. Karate was developed on Okinawa, which is now a part of Japan. It used to be a separate country and a tributary of China. Karate was a combination of the Okinawa wrestling and Chinese Kung Fu. In the 1930's karate was introduced to the main islands of Japan.
The Sai is a weapon taught in kabudo. It is a art related to karate and often taught in karate schools.