Physician: There were approximately 83, 400 trampoline-related injuries last year. This suggests that trampolines are quite dangerous and should ttherefore be used only under professional supervision. Trampoline enthusiast: I disagree. In the past ten years sales of home trampolines have increased much more than trampoline-related injuries have: 260 percent in sales compared with 154 percent in injuries. Every exercise activity carries risks, even when carried out under professional supervision. The dialogue provides the most support for the claim that the physician and the trampoline enthusiast disagree over whether ['trampoline use is an activity that warrants mandatory professional supervision', 'trampolines cause injuries to a significant number of people using them', 'home trampolines are the main source of trampoline-related injuries', 'the rate of trampoline-related injuries, in terms of the number of injuries per trampoline user, is declining']