Boys use eight mobile phones to punch in and find roommates to exercise. Does this make sense? It is meaningless to punch in this way, because it is meaningless to let students punch in, because it is to let students exercise and keep healthy. If this boy uses eight mobile phones to punch in his roommates, it is meaningless, because the most fundamental thing of punching in sports is to make these students' physical fitness better.

For the sake of students' good schools, it is meaningless to set up this sports punch card, because they want to make these students' physical quality better. Then the boy's behavior will lead to this meaningless sports punching, and will not exercise the students' health. Therefore, it is meaningless. The boy's behavior is also harmful to his roommates.

The purpose of sports punching is because many schools set up this sports punching because they know many college students, so lying in the dormitory all day without exercise will lead to a decline in physical fitness. Therefore, in order to improve students' physical quality, these schools set up this sports punch card, so the boy's behavior is harmful to his roommates, resulting in these students not getting an exercise.

Generally speaking, I can only say that this boy's behavior is meaningless, and it hurts one of his roommates and makes them unable to get exercise, which is equivalent to ruining their health. Therefore, punching cards is meaningless.