Tennis court, racquets and balls on site; according to your wishes, it turns into multisport with practicing basketball, handball, volleyball or mini football ... for team tournaments
The way of counting points in tennis comes from the "jeu de Paume": This French game, played in the 16th and 17th centuries, is the ancestor of tennis created by the English in the 19th century ("tennis" is also the deformation of French word "hold !", pronounced by the player throwing the ball).
In the "jeu de Paume", it is assumed that the winner of the point had to advance each time 15 steps in the direction of the net (15, 30, 45 or 60 paces from the service line), and the one who reached the net, located at 60 steps, won the game. The number 40 would be a shortcut to 45, too long to pronounce.
When the players were tied at 40, the advantage was to take 5 more steps.