trampolining       
noun [ U ] uk/ˈtræm.pəl.iː.nɪŋ/ us/ˌtræm.pəˈliːn.ɪŋ/
 蹦床
the sport or activity of performing physical exercises on a trampoline (= a piece of sports equipment that you jump up and down on)
  Rebecca's main hobby is trampolining. 吕贝卡的主要业余爱好是蹦床。 
 The centre offers recreational trampolining and lessons for beginners to experts.  这个中心提供休闲蹦床还为从新手到专家级学员开设各种课程。 
 See: trampoline
 - More examples
- Last week, Russia captured the first gold medal for trampolining at the Olympics.
- Trampolining is tough physical exercise.
- There are hundreds of trampolining clubs across the country.