Originally, the game of tennis was played exclusively on natural grass. Nowadays, you will find this type of tennis surface increasingly rare, because it is so expensive and has a very low durability. Later on, the clay courts have seen the light of the day. This favourite type of tennis surface is commonly used, although its maintenance is very demanding – the surface needs to be levelled and watered after each game, there is a necessity of regular servicing of the courts etc. Although the concrete tennis courts go past the problem with maintenance, they suffer yet another illness – their surface is unpleasantly hard and, consequently, very demanding on players' health.