Fall craft
A small angled mini-trampoline used as a launch aid for stunt jumps — the workhorse rig under any "long jump across a gap" frame.
Mechanism
A spring board is a low-profile mini-trampoline angled at 30-45 degrees toward the direction of jump. The performer plants their lead foot on the bed during a running approach; the bed compresses and rebounds, converting horizontal speed into vertical lift. The board is buried in set dressing, behind a mark on the road, or under a thin scenic skin so it reads as ordinary ground at camera distance. Spring tension is calibrated to performer mass and desired arc apex.