Cat nap and playing on a joggling board. A joggling or jostling board is a long, pliable board that is supported on each end by wooden stands. The board is springy and a person sitting on it can easily bounce up and down. It originated in the Lowcountry of South Carolina around Charleston in the early 19th century.
According to one popular, but totally unsupported, story about joggling boards, the device was used by courting couples. The male and female would sit at opposite ends of the board and bounce up and down. Because the board slopes in the middle, the couple would bounce toward each other and eventually meet in the middle. Sore bums, but new chums.