The apparatus is the handiwork of a company in the UK called Stunt Asylum, and the device is specifically designed to train stunting novices. In addition to the stabilizers at the side for balance, the bar at the back adjusts how high the tail can go. The wheels at the front also mean that if there's a brake lock-up, the rider still doesn't crash.
According to Visor Down, the price for one of these classes is is 240 pounds ($370). That seems quite reasonable compared to potentially crashing your own bike, not to mention avoiding injuries. Watch the video above to see how it works.