This is a pose of "Zenkutsu-dachi, Gedan-barai" of karate.
"Zenkutsu-dachi" means standing with bending the front leg. "Gedan-barai" means sweep the opponent's skill to lower of the body.
This is a basic style by standing and block by hand.
In dojo(karate gym), they repeats the lesson with moving with this posture. All students of karate learn this lesson.
"Zenkutsu-dachi, Gedan-barai" from [Brave Stream Blog] (May 27, 2009)
It is a traditional style for basic trainimg of karate .Almost of newcomer to dojo will learn this skill first....