The History Source on Instagram: "In the 1950s, the bongo board became a brief fitness fad, combining balance training with a sense of fun. The simple board-and-roller setup was marketed as a way to get in shape. Balance board training has remained a go-to exercise for improving coordination and core strength, but this vintage footage reminds us that fitness fads are far from a modern trend. From 80s-era jazzercise to the hula hoop craze of the 1920s, the pursuit of staying fit has sparked creat