how did p.e. started in greece??

Please check this site about the Olympics of ancient Greece.

http://www.olympic.org/uk/games/ancient/index_uk.asp

If you mean that PE is phsical education then the answer is below.

The site Ancient Greece: KIN 375 -- Historical Analysis of Physical Activity breaks up the origin of physical education into two major areas.

THEORIES ABOUT THE ORIGINS OF PLAY
1) Play as a utilitarian behavior--play emerged from and was linked to survival skills such as hunting, fishing, and boxing.
2) Play as an instinctive behavior--humans have a natural need for play (play behaviors are also readily observed in the animal kingdom) and thus have always played whether they need to practice or acquire a skill or not. What people learn is immaterial to whether or not people play.
3) Play as a ritualistic behavior--games explain forces in the world that are not understood. By participating in the ritual one explains the meaning of a certain kind of event.

THE ORIGINS OF BALL GAMES
As far back as we know people have played ball games. There are several possible explanations:
1) Ball games are tied to religious events and magical functions. We now take for granted the characteristics of a ball, but ancient cultures thought the perfections of a sphere was godlike.
2) One function of ball games which appears to be pre-eminent was a fertility function. Games were played to rejoice in the production of food, children, and the seasons. The association of games with fertility pops up throughout history. For example:
Winter breaks, Spring comes in. The earth is going through a process of rebirth. People celebrate by playing games.
Another time of play is in the Fall because of the harvest.
Another time of play is at the height of the Summer when the days become longer and spring is on its way.
finally, Winter solstice (sol, the sun + sistere, to cause to stand still--either of two points on the sun s ecliptic at which it is farthest north or farthest south of the equator) a time of celebration as the days become longer and Spring is on its way.

THESE TRANSLATE ROUGHLY IN MODERN TIMES TO EASTER, THANKSGIVING, CHRISTMAS, AND THE ADVENT OF SUMMER. SPRING IS BIRTH, SUMMER IS JOY, FALL IS HARVEST, WINTER IS DEATH.

Physical education in Greece, like many ancient cultures, had its origins in various theories and practices.

One theory suggests that physical education emerged from and was linked to survival skills, such as hunting, fishing, and boxing. In this view, play was a utilitarian behavior, where individuals engaged in activities to develop and improve their skills for survival.

Another theory posits that play is an instinctive behavior found not just in humans but also observed in the animal kingdom. According to this perspective, humans have a natural need for play, regardless of whether they need to practice or acquire a skill. The focus here is on the intrinsic enjoyment and benefits of play rather than its practical applications.

There is also the belief that play can serve ritualistic purposes. Games and physical activities were seen as a way to explain unknown forces in the world. By participating in these rituals, individuals sought to understand the meaning of certain events or phenomena.

As for the origins of ball games, they can be traced back as far as we have historical records. One explanation is their association with religious events and magical functions. The perfect spherical form of a ball was considered godlike in ancient cultures. Additionally, ball games had a fertility function, symbolizing the joy and abundance of food, children, and the changing seasons. Different times of the year, such as winter breaks, spring, the harvest season, and the summer solstice, were occasions for celebration and playing games.

In modern times, we can draw parallels between ancient festivities and contemporary holidays such as Easter, Thanksgiving, Christmas, and the arrival of summer, where spring represents birth, summer represents joy, fall represents harvest, and winter symbolizes death.

If you want to learn more about physical education in ancient Greece and its relationship to the Olympic Games, you can visit the following website: http://www.olympic.org/uk/games/ancient/index_uk.asp