1, dark and humid. Wet ground will lead to more indoor water vapor, and there will be a layer of water vapor on the floor, which is easy to cause people to slip when walking. In addition, the fitness equipment will feel uncomfortable to the touch, which will reduce the service life of the equipment and is not convenient for maintenance.

2. Lighting and ventilation problems. There is almost no possibility of lighting on the first floor, and the comfort is very low. At the same time, the natural ventilation is poor, which has obvious influence on the air. There are many people exercising in the gym, and they sweat a lot on weekdays. If the ventilation and lighting are not good, there will be an unpleasant smell of sweat in the room, which is difficult to remove.

3. Security issues. Although the negative 1 floor can't fully show the overall quality of the building, it can't be completely avoided, so it may lead to problems such as water leakage.