What do you think about me pushing the students hard to the point where several of them get torn calf muscles?
How come you want to injure your students?
They are lazy students who don't want to spend time in the gym.
That is irresponsible of you as a teacher or coach. You shouldn't want to push your students too hard that they injure themselves. It will not benefit anyone if they hurt themselves.
I'm only doing it because I want to.
If that's why you are doing it then you should know that pushing them for your own amusement may eventually backfire. Most of your students probably already dislike you, and if the injuries mount up then their families may get involved and rally to get you fired. Is it worth all of this?