The reason for this is the following：

1, easy to transport, not easy to be damaged during transportation, and relatively low transportation cost.

2, the installation is firm, each glass has four installation holes, if separated, the hollow area of the glass can be reduced.

3, not easy to break, easy to replace. Due to separate installation, each piece of glass has small hollow area, uniform stress distribution and is not easy to be damaged. In addition, most of the equipment in the gym is made of iron. Although the discus is coated with glue, it is too heavy and easy to be damaged when it touches broken glass, so the replacement cost of the next piece will be much lower and the replacement process will become much easier.