Longman Dictionary of Contemporary English
trampolining
noun
EXAMPLES FROM CORPUS
▪ But trampolining won't be catching on with the other animals.
▪ They joined in Medau Classes and various sports; they tried trampolining, pistol shooting and weight training.
Wiktionary
trampolining
vb. (present participle of trampoline English)
Wikipedia
Trampolining
Trampolining is a competitive Olympic sport in which gymnasts perform acrobatics while bouncing on a trampoline. These can include simple jumps in the pike, tuck or straddle position to more complex combinations of forward or backward somersaults and twists.
Outside the Olympics trampolining also includes the events of synchronized trampoline, tumbling (or power tumbling) and double mini-trampoline.
Usage examples of "trampolining".
A ten-dollar bill fed into the slot bought you five minutes of free-fall gymnastics in a Swiss orbital spa, trampolining through twenty-meter perihelions with a sixteen-year-old Vogue model heady stuff for the Jungle, where it was simpler to buy a gun than a hot bath.