My kid is 17 and loves to ski. He has been skiing since he was young. He skis about 12 times a year and has good skills. But he skis too fast. He says he is in control, but the speeds he skis at (regularly 50mph and sometimes more) scare me and I think they are excessive. I am trying to figure out how to set limits /give him guidance on how fast is too fast, for his own safety and for the safety of those around him. I am finding it hard to define in concrete terms since the general advice is to ski "in control" and he says he is in control. I would also like to tell him he can't use Strava or Slopes because I don't want him skiing for time. (He says he doesn't, but I don't fully believe that.) …. Any advice on how to constructively mentor and set limits around this? I am getting to the point where I want to ground him from skiing until he agrees not to make speed the focus, but that will make him super resentful and will be difficult / impossible to enforce. And he is in a phase where he doesn’t really listen much to me as it is. I feel like I need to find mentors that can hopefully get through to him.