Should students have to take P.E. classes?

I think that students should have to take P.E. classes.
I have some reasons about that.
First, students can build up their physical strenth by P.E. classes.
Now, there are a lot of TV games and portable game players in the world, so I think students paly in the house and the opportunities which they play outside are dcreasing.
I think that cause many students to lack physical strenth.
Therefore, students take P.E. classes and they have to take exercise at only school.
Second, I think that students can cultivate the cooperation through P.E. classes.
In P.E. classes, students play some team sports. The team sports need to cooperate each other and talk about the game plan to win the game.
I think students can't learn that from the normal classes like math,Japanese,science,and society.
Finally, I think students can radiate their stress .
I have heard that the modest exercises are good for the health and can get rid of the stress.
Therefore I think students should take P.E.classes.