In the 1980s, the attic was where my mother’s fitness-fad equipment went to die. Up there—near the NordicTrack, the Jane Fonda videotapes, and the ThighMaster—was a mini-trampoline, intended for use ...

It’s like a family fun center, Jerry Raymond would tell the banks. Except there are trampolines everywhere. Trampolines as dodgeball courts, trampolines to bounce on and trampolines to launch yourself ...