Sport is healthy. Movement keeps the circulation going and strengthens the muscles. This "truism" applies to all age groups. The joints and locomotor system should be promoted - without overtaxing them. Injuries during sports should be avoided wherever possible. The rules of the respective sport as well as the sports equipment and the surroundings, e.g. the sports hall, contribute to this. The essential part of a sports hall is the hall floor. It differs from the usual floors in houses and offices and on the road.