非競爭性非體育性的Trampolines,就是玩的意思。 就像”Recreational drug use“ 一樣。。。
https://www.healthychildren.org/English/safety-prevention/at-play/Pages/Trampolines-What-You-Need-to-Know.aspx
AAP Recommendation
Don't buy a trampoline for your home! Trampolines may be popular and a fun way to get exercise, but there are safer ways to encourage your children to be physically active, such as playing catch, riding a bike (don't forget a bike helmet), or playing a team sport.
The AAP recommends that mini and full-sized trampolines never be used at home, in routine gym classes, or on playgrounds. They should only be used in supervised training programs for gymnastics, diving, or other competitive sports. Only one person should be allowed on a trampoline at any given time.