The manufactured trampoline, as we know it today, was created by two men, George Nissen and Larry Griswold.
Around 1935, Griswold, then the assistant gymnastics coach at the University of Iowa, and Nissen, a tumbler on the
University of Iowa gymnastics team, "made regular jaunts to
Bloomington, Illinois where numerous circus people had their winter homes.
Among them were the "Flying Wards", some of the finest trapeze performers in the world. Griswold and Nissen worked out with them at the local YMCA, and frequently helped them make or mend their large trapeze nets. Nissen remembers the hours they spent in the basement of the YMCA, threading the long cords of the nets, using large javelin-head needles.
This experience was one of